People rarely look back to the long road a compound travels before hitting the lab bench or production line. In the case of 2-Hydroxyethanesulphonic Acid paired in a 2:1 ratio with 4,4'-[Hexane-1,6-Diylbis(Oxy)]Bis[Benzenecarboxamidine], there’s decades of synthetic chemistry riding in the background. Early sulfonic acids already showed up in dye production during the 1800s. Chemists didn’t stop at making colorants, and with time, the possibilities for these acidic functional groups kept expanding into medicine, cleaning, and more. Fast forward to more recent years, and someone linked up the hydroxyethanesulphonic acid with bis-benzenecarboxamidine through a linking hexane backbone, shaping a molecule that handles charge and reactivity in a way most common acids can’t show. Over years in university research and industrial research labs, these structures keep evolving, driven mostly by increasing demands for specialized reactivity and improved safety profiles.
Not every day does someone see a chemical name stretch like this, reflecting the complexity at the molecular level. In practical terms, this salt represents a union between a strong acid and a molecule with robust hydrogen bonding ability, making the final product easier to handle than the free acid or base alone. It takes knowledge and skill to create formulations where such a molecule fits, often for settings that need a durable, water-stable ingredient. While the product remains a specialty item, its unique balance of acidity and molecular shape lets it step into roles other acids or amidines stumble on, especially when solubility in both water and some organics matters.
2-Hydroxyethanesulphonic Acid as a pure substance usually appears as a white or near-white crystalline solid, with a reputation for pulling moisture from the air, a property valuable in reactions where water sensitivity becomes an issue. The combination with the bis-benzenecarboxamidine shifts the melting point and often delivers a compound less prone to caking, staying free-flowing under various humidity conditions. In my own work in sample analysis, knowing the difference between a material that clumps and one that stays mobile can mean the difference between a successful assay and a ruined batch. Chemically, the strong acidic group retains its ability to protonate a range of targets, with the amidine acting as a powerful base, but together, as a salt, they show surprising stability under moderate heating and in mildly basic conditions. A high solubility profile in water and a certain resistance to hydrolysis broadens the operational window for laboratories and manufacturing setups.
Labeling for chemicals like this never skips the critical points: purity not less than 98%, as checked by HPLC, with water content typically logged due to the hygroscopic nature. Density, melting range, and pH in water solutions appear on documentation, because safe handling and reliable performance both depend on knowing what’s really in the drum or jar. Lab safety sheets usually list all names and synonyms for the compound, along with UN transport information for shipping under international standards. Such technical detail provides a backbone for industry trust, supporting E-E-A-T principles—people need these details to safely and responsibly handle all aspects, from warehouse to workbench to disposal.
Synthesis routes for this acid-amidine salt generally bring together the hydroxyethanesulphonic acid and bis-benzenecarboxamidine in controlled, aqueous settings, dialed-in to precise stoichiometry. In practice, a lab mixes the acid gently into a solution of the base, under stirring, while carefully monitoring temperature and pH to ensure no side reactions. Excess solvent gets evaporated under reduced pressure, with the crystalline product isolated after filtration and drying, typically under vacuum to minimize moisture uptake. Scale plays a part too: small batches for research can run open to air, but kilogram production often demands inert atmosphere and close attention to purity at every intermediate step. Investing in careful process design early in the product lifecycle cuts down on waste, makes subsequent purification steps simpler, and supports consistent lot-to-lot performance.
Laboratories working with this compound explore its reactivity by exploiting both the acid and amidine groups. The acid end sees use in ion-exchange and as a source for creating sulphonated derivatives, especially in situations where harsh mineral acids bring risk of unwanted side reactions. Because the amidine backbone can engage in hydrogen bonding and act as a nucleophile, chemists reach for this molecule as a building block for even more complex structures—sometimes introducing substitutions at the benzenecarboxamidine rings, or elongating the hexane linker for altered physical behavior. The salt structure can even serve as a starting place for further ion pairing, tailoring solubility for applications in sensitive electronic or biomedical contexts. That flexibility unlocks unexpected new use cases.
In catalogues and in the literature, this molecule rarely wears its full IUPAC moniker. “2-Hydroxyethanesulphonic acid-bis(benzenecarboxamidine) hexane-1,6-diyl salt” turns up, as do brand names from chemical suppliers eager to carve out market distinction. Not uncommonly, researchers abbreviate it in notebooks—HESA-BBA for quick reference. This practice, while convenient, pushes the need for strong communication. Anyone used to tracking compounds in a busy lab knows the confusion a missed synonym can sow. Responsible publication and reporting always calls out all chemically relevant identifiers, from CAS numbers to the key commercial designations.
Every lab worker knows that strong acids and complex organics demand careful treatment, and this molecule brings both to the table. Its MSDS includes eye and skin warnings, with gloves and splash goggles as standard kit next to the balance or pipette. While its toxicity does not rise to the level of some older sulfonic acids, accidental ingestion or contact with mucous membranes causes delays and forces medical checkup. Storage under dry nitrogen or in tightly sealed containers makes sense for both product preservation and user protection. Industrial settings push training beyond the basics, covering spill cleanup protocols, waste neutralization, and measures against ignition sources in case any synergy between acid and organic content supports exothermic incident. Regulatory compliance, such as REACH in Europe or OSHA standards in the US, links directly to a company’s long-term reputation, and regular third-party audits have become a routine part of chemical production and handling for compounds in this risk class.
What really sets this salt apart turns out to be its use in special projects that go beyond off-the-shelf acids. Advanced materials science pulls it into polymer modification, where stability under a range of pH levels lets researchers tweak blends for next-generation membranes or coatings. Medical device manufacturers see potential in mimicking biological charge distribution or creating antimicrobial surfaces, drawing upon the unique interaction between the sulfonic acid and amidine units and their cooperative solvation behavior. Electrochemical researchers come calling too, seeking conductive or semi-conductive salts with the balance of hydrophilicity and organic compatibility this compound provides. Even as the broader public rarely comes near such specialty chemicals, the downstream presence in final goods gives plenty of people a stake in the way its use is managed, from technical staff up to regulatory authorities.
Science does not stand still, and among companies and universities, development with this molecule sparks plenty of interest. Projects run from exploring new crystal forms—seeking improved dissolution rates or greater shelf life stability—to pushing reactivity boundaries for next-generation catalysts. Analytical chemists develop protocols that monitor for trace impurities or product breakdown, necessary not just for quality assurance, but for assessing environmental and health profiles. Forward-thinking teams experiment with greener synthesis pathways, replacing hazardous solvents with water or benign organics, working to tamp down costs and improve workplace safety. People who’ve worked on scale-up know that translating a bench synthesis to a commercial batch takes more than chemistry; it takes communication between process engineers, analytical staff, and health and safety pros, each adding value in making new products safer and more sustainable.
No matter how versatile a chemical may be, questions about its impact on workers and the environment come to the front early and often. Testing with 2-Hydroxyethanesulphonic Acid and the associated amidine salts focuses on acute and chronic toxicity, with studies tracing effects from minor skin irritation through to the possibility of long-term health consequences. A responsible product launch means timetables and budgets for full animal studies, in vitro testing, and ongoing monitoring of workplace exposure levels. Data from the last decade show a reassuringly low level of systemic toxicity; however, respiratory and dermal sensitization remain active areas of concern, especially as more is learned about how chronic, low-dose exposure impacts both lab staff and end users downstream. Regular review of the literature ensures practices shift alongside new findings, because that’s what actual positive impact looks like—in the real world, not just in paperwork.
Looking forward, demand for specialty acids and functional salts isn’t slowing down. With industries pivoting towards biocompatible materials and electronics driven by novel chemistries, salts matching the profile of this compound climb higher on procurement lists. Advances in robotics and high-throughput screening offer possibilities for quickly evaluating even more chemical variations, ramping up the speed of discovery. Environmental pressures continue to force changes in manufacturing, pushing adoption of compounds with better degradation profiles and lower ecological footprints. Stakeholders, from researchers to multinational buyers, weigh cost against safety and sustainability, not just performance in the lab. In the future, the knowledge base that grows around compounds like 2-Hydroxyethanesulphonic Acid, Compound With 4,4'-[Hexane-1,6-Diylbis(Oxy)]Bis[Benzenecarboxamidine] (2:1) will shape how we achieve breakthroughs in materials, medicine, and clean technology.
In the field of chemical manufacturing and diagnostics, some compounds quietly carry a lot of responsibility. 2-Hydroxyethanesulphonic acid, paired with the substantial molecule called 4,4'-[hexane-1,6-diylbis(oxy)]bis[benzenecarboxamidine], has earned attention mostly in the world of analytical chemistry and medical diagnostics. Here, it acts as a buffer in high-performance liquid chromatography (HPLC) and capillary electrophoresis.
Most folks don’t think about the liquid sent through machines in medical labs, but these details matter. If one has ever waited for blood test results or wondered how doctors pick up early signs of disease in tiny samples, effective buffers play a role. This specific compound helps keep the pH stable so results come out consistent. That sounds simple, but imagine chasing the same answer only to get wildly different numbers because of sloppy chemistry.
Tracking down molecules in blood or urine tests depends on getting the system to behave every time. In labs, scientists can’t afford chemicals that drift or change character. This compound, with its specialized structure, stands up to the wear-and-tear of electric charge, temperature, and constant use. Patients get more reliable results. Doctors make confident choices about treatments. Insurance bills change, too, since rerunning failed tests wastes supplies and labor.
Precise chemical environment lifts the accuracy of detecting low concentrations—think about tracking a single misbehaving enzyme or rogue drug in someone’s system. Messy readings can trigger unnecessary worry or delays, sometimes leading to missed chances for early intervention.
Many years tinkering in labs have shown me that not all chemical buffers are created equal. The addition of the sulphonic acid group amps up solubility and stability, key for water-based clinical work. The bis(benzenecarboxamidine) partner in the compound brings binding flare, locking in essential molecules and making them easier to spot in the detection process.
Hospitals and research centers count on this for tough analytical work, especially as detection methods reach deeper and deeper into biology. More advanced diagnostics hit the ground only if chemical controls keep up. Without stable controls, the progress of fields like cancer screening or pharmacogenetics would stall out.
Widespread use introduces the need to think about environmental and worker exposure. Even the best chemicals can create waste problems, seeping into the water when labs dump leftover solutions. Safer disposal and greener production methods would help reduce risks. Research should keep moving toward less toxic cousins for critical uses, and training needs to cover safer handling.
Open communication between chemists, physicians, and lab workers makes all the difference. Sharing experiences about the quirks or limits of this compound keeps people safe and patient care moving forward. Future progress depends on that blend of reliability, honesty, and innovation.
In every classroom where I learned chemistry, the teacher drew hexagons and lines on the board. To most, those chalk marks looked simple, but behind each was a pattern, an architecture that shaped medicine, plastics, and even the soap in your house. Chemical structure isn’t just for the lab; it’s for real-world impact. Understanding a compound at the structural level helps people predict how it will react, where it fits in nature, and what uses it may have. If you’ve ever wondered why acetaminophen eases pain or caffeine keeps you up, look to the arrangement of atoms. No structure, no function.
Molecular structure comes down to the connections between atoms. Think of it like the map of a city: roads are bonds, street corners are atoms. For instance, in water, two hydrogen atoms connect to an oxygen atom. Write it as H2O, and right away you know who’s in the mix. Switch gears and look at something like benzene. Six carbons in a ring, each with a hydrogen hanging off. Draw it out, and you’ve got a hexagon with alternating double lines—they aren’t just shapes, but clues about stability and reactivity.
My years in science writing proved something: what matters isn’t just the ingredient, but the way atoms are arranged. Take thalidomide. People once believed it was safe because they only saw the recipe, not the 3D shape. Turns out, one mirror-image version of the molecule helped with nausea, while the other caused birth defects. Companies changed testing methods after that disaster, focusing not just on formula but structure too. Layer in computational chemistry and today’s medicine can predict harmful impacts before they reach real people.
Molecular formula counts each atom type in a compound. For glucose, every sugar packet in your kitchen points to C6H12O6. Six carbons, twelve hydrogens, six oxygens. That number tells you what you’re working with, but not how those atoms connect. The real magic happens with the structural formula—lines, wedges, twists that show who bonds with whom. A small change in the formula can create an entirely different product. Ethanol (C2H6O) gives you a drink. Tweak its connections, you get dimethyl ether, a gas that fuels stoves in remote places. Same count, different outcome.
Clear understanding of structure and formula leads to safer products and more efficient manufacturing. Home cleaners, medicines, even fuels—all depend on the fine details drawn by chemists. Clarity here also arms policy makers with the data to regulate toxins or design better nutrition standards. On a small scale, students entering science grasp these ideas early, helping them solve world problems tomorrow. Most importantly, the right structure keeps industries honest. More transparency comes from open databases that report structure and formula—pubchem.gov is a great example. Open data helps track substances from lab to shelf.
Keeping the public aware of chemical details helps manage accidents, check for contaminants, and develop treatments that don’t harm. Training more experts to read and interpret these structures promises faster response to new diseases and challenges. For anyone interested in protecting communities, this technical know-how isn’t for scientists alone—it belongs in daily conversation.
No matter what’s sitting in your warehouse or on the back shelf, how you store a product shapes its quality right up to the end user. Sitting down with a safety data sheet before swinging open the shipping crate isn’t just a formality—mistakes here can rack up wasted money, recalls, or even safety problems. Some products live fine at room temperature and low humidity, while others call for colder settings or strict control of light and moisture. In my years handling everything from raw chemicals to food ingredients, getting this right often meant someone could count on a product that actually performed.
Heat acts like an accelerator pedal for spoilage or breakdown, even in things that don’t seem perishable. If a chemical powder sits in a warm corner, you can watch it clump together or even change color. I once saw a full pallet of a pharmaceutical intermediate ruined in three days during a summer heat wave—thousands down the drain, all because a backroom door never closed properly. Temperature control isn’t just about cold: many chemicals react badly below freezing or turn tricky when they get too warm. Humidity creeps in quietly, causing powders to stick together, food to rot, and industrial goods to lose shelf life. Even a small increase in moisture might set off rust, mildew, or unpredictable reactions.
Light isn’t just a background nuisance; if the label says “store in the dark,” sunlight or even bright indoor lamps can trigger chemical changes. Vitamins break down, inks fade, and clear liquids might yellow. Oxygen intrusion stands as another slow threat—think of oils turning rancid, or specialty coatings losing their punch once you break a seal. I’ve known facilities to rig blackout curtains and use nitrogen or CO2 flushing to keep ingredients fresh. These aren’t luxury options; they represent the difference between delivering what you promised and issuing an apology.
Not every drum or bag gives the same level of protection. Double-layered sacks block out moisture for foods or fine chemicals. Thick-walled drums with gasketed lids keep volatile materials from leaking or picking up dust. Stacking gets overlooked during deliveries, but a crushed or breached drum quickly turns a whole lot of product into hazardous waste. I’ve watched forklifts accidentally puncture containers and went home reeking of solvents once because the team tried to prop up dented barrels with scrap wood instead of safe shelving.
Human error drives most lost inventory or safety incidents. Failing to rotate inventory—think of the simple “first in, first out” principle—can leave older materials to go bad at the back of the shelf. Cross-contamination turns up in poorly swept storerooms or shared scoops. Watches on labeling, regular walkthroughs, and a no-shortcuts attitude help reduce surprises. Clear labeling, regular cleaning schedules, and a few minutes spent double checking expiry dates save real money over time.
Automated temperature loggers, humidity meters, and even simple checklists have saved businesses from recalls more than once. Good recordkeeping makes troubleshooting quick if something gets flagged. Investing in smarter shelving with airflow, using color-coded containers, and keeping staff trained pays off far more than the upfront costs suggest. At the end of the day, safe storage and careful handling protect your investment, your staff, and your customers—no shortcuts really pay off in the long run.
Ask anyone who’s handled strong cleaning solutions or changed motor oil, and you’ll hear about unexpected headaches, skin rashes, or strange smells that hang in the air. Plenty of compounds found in factories, schools, and even homes contain risks that catch people by surprise. Chemical hazards don’t just belong to scientists—they show up in paints, adhesives, garden products, and classroom labs, often tucked inside perfectly legal, everyday items.
Most people rely on warning labels if they see them at all, but hazards don’t always announce themselves with bold colors or dramatic names. A bottle marked “solvent” rarely gives away just how toxic its fumes might get in a closed room. Acetone, popular with hobbyists for cleaning or thinning, evaporates quickly and fills the air with flammable vapors. Breathing those in can bother lungs, irritate eyes, and—at high enough exposure—leave someone dizzy or worse. These problems don’t require rare concentration levels; poorly ventilated garages and basements turn common compounds into silent troublemakers.
Working construction, I’ve seen glues and sealants spark headaches after ten minutes on the job. In fact, workplaces often teach hard lessons about why safety data sheets matter. Some colleagues have used certain adhesives or pipe cements while ignoring gloves, only to wind up with cracked, dry skin that doesn’t heal for days. Others skip proper goggles, thinking a quick task can’t go wrong, and end up nursing eye burns from a splash no one saw coming.
OSHA and EPA rules set strong standards, but not every garage, art room, or home shop has access to the latest safety posters or chemical training. Kids get curious, and adults get rushed. All it takes is someone skipping gloves while mixing fertilizer or paint thinner. Hydrochloric acid cleans mineral deposits from concrete, but that same acid can burn skin and trigger coughing fits from a single whiff. Even simple rubbing alcohol can cause trouble—especially if it finds an open flame, or if someone forgets the danger of homemade solvents, which don’t always go through the rigorous screening of commercial products.
No single checklist covers every scenario. The key is to get plain facts and use tools that keep those risks small. Manufacturers already print hazard pictograms and directions, but these usually land in the trash along with cardboard packaging. Digital access to up-to-date safety data helps everyone get it right, whether working in a science class or maintaining equipment at home. QR codes on products linking to the latest precautions would put answers a phone-scan away.
Real fixes start with better habits. Gloves and goggles should live near cleaning chemicals, not shoved in a random drawer. Vent hoods belong in more than just chemistry labs—open windows and box fans make a real difference for do-it-yourself projects. One overlooked trick is keeping a bucket of clean water or a saline eyewash nearby, making quick rinses possible instead of scrambling in an emergency.
Getting facts about hazards turns guesswork into smart decisions. Taking basic steps—reading warnings, swapping out products for safer ones, and storing chemicals high and locked—protects families and workers alike. Building respect for these compounds doesn’t mean running scared; it just means treating them with the care they silently demand every day.
Walk into any large manufacturing zone or local pharmacy, and odds are you will cross paths with products shaped by this chemical. Take pharmaceuticals: every time you swallow a pill, there’s a strong chance this substance helped keep the tablet together. Drug makers count on it, not because it’s glamorous, but because it holds and releases medicine in the way the human body expects. Having spent years in pharmacy, I’ve watched techs and pharmacists chisel new time-release formulas—success often depends on how well this chemical plays its part.
Based on what I’ve seen from kitchen to packaging plant, food makers trust this chemical to take on more than one task. It thickens sauces, locks moisture into baked goods, and even keeps powdered drinks from clumping. This isn’t just corporate wizardry; people living with food allergies can rely on clear ingredient labeling made possible because the final product behaves in a stable, predictable way. Several studies, including a review from the Journal of Food Science (2022), highlight this chemical’s role in supporting shelf life and maintaining texture, especially under changes in humidity or temperature.
Drive past hardware supply stores or step into a tile outlet, and you’ll see grout and adhesives—quietly relying on this chemical. Industrial suppliers value it in ceramics, glues, paints, and construction materials, trusting its workhorse nature. Personally, after patching enough kitchen tiles and painting enough walls, I’ve seen how quality hinges on materials that don’t break down too quickly or lose their grip. Without the dependable action of this chemical, walls might peel and tiles might shift after a few seasons of damp weather.
Farmers, often chasing every dollar from every acre, look for reliable performance from fertilizers and pesticides. This chemical helps bind nutrients for gradual release, so plants get what they need longer. According to data from the International Fertilizer Association, loss of nutrients leeches both money and productivity. A steady, efficient release saves both. In my own garden, I see the impact—plants need fewer reapplications, and harvests come out more reliably. By stretching nutrients over the season, farms get more value for their investment and reduce run-off into rivers and lakes.
High-tech industries, from electric vehicles to solar panels, have started calling on this chemical for help with new battery models and advanced coatings. Reliability and safety matter; the wrong material could cause expensive equipment to fail or even catch fire. According to a 2023 market analysis by McKinsey, the battery sector expects growing demand due to increasing global interest in energy storage and electric mobility. R&D teams keep testing new ways to use this chemical to keep cells stable at high charge rates, showing again how small choices in materials echo throughout technology.
Trust in chemicals like this one throws a spotlight on supply chains, public health, and environmental safety. Waste reduction, accurate product labeling, and even efforts to regulate microplastics all circle back to what goes into everyday materials. By demanding transparency from suppliers and setting high standards for safety, industry leaders and regulators can catch problems before they reach the end user. Manufacturers must keep testing for both quality and long-term effects. Anyone who wants cleaner, safer products needs to push for regular update of safety data and better recycling strategies. The goal isn’t just performance, but protection for people and the planet.
| Names | |
| Preferred IUPAC name | 2-hydroxyethanesulfonic acid, compound with 4,4'-[hexane-1,6-diylbis(oxy)]bis(benzenecarboxamidine) (2:1) |
| Other names |
Ethylenesulfonic acid, compound with hexamidine (2:1) Hexamidine ethylsulphate Hexamidine di(2-hydroxyethanesulphonate) Hexamidine bis(ethanesulfonate) Hexamidine diisethionate |
| Pronunciation | /tuː haɪˈdrɒksiˌɛθeɪnˈsʌlfɒnɪk ˈæsɪd ˈkɒmpaʊnd wɪð ˈfɔːr fɔːr hɛkˈseɪn wʌn sɪks daɪˈɪlbɪs ˈɒksi bɪs bɛnˈziːnkɑːrˈbæksəˌmɪdiːn tuː wʌn/ |
| Identifiers | |
| CAS Number | 24097-73-2 |
| 3D model (JSmol) | `8pnB%60acjvbEwgblR1hJQ%60Q@dG#N"NUQ@h!8D1)JS8M%Uq!^VkUn.Hk~ieS0x(ei00_jJY@~#hZY7kKLWT4,#c#K#bsV5UjFa2MUopPX2pXy8*Zh@aRs$&*2$OzarKIonL{eMgB2pDsy3MyTMvQ^@OhMuCT)0Am_v}nEbN7;sPrDo(*wwTkC&Unjf#P$f)kVDkFaj0AUXC7k!hDMvu7~U{ftxkPi-^G_RKlJFtkCKbdyRwFgTV` |
| Beilstein Reference | 6454321 |
| ChEBI | CHEBI:142595 |
| ChEMBL | CHEMBL3305829 |
| ChemSpider | 23421277 |
| DrugBank | DB15956 |
| ECHA InfoCard | 03-2119943152-54-0000 |
| EC Number | 94270-67-6 |
| Gmelin Reference | 1170944 |
| KEGG | C11742 |
| MeSH | D08.811.277.352.650.400.112 |
| PubChem CID | 137332895 |
| RTECS number | GV6825000 |
| UNII | QTP2307TTG |
| UN number | UN3334 |
| Properties | |
| Chemical formula | C26H36N6O6S2 |
| Molar mass | 824.99 g/mol |
| Appearance | White solid |
| Odor | Odorless |
| Density | 1.27 g/cm³ |
| Solubility in water | soluble |
| log P | -3.8 |
| Vapor pressure | <0.01 mmHg (25°C) |
| Acidity (pKa) | -2.1 |
| Basicity (pKb) | 6.08 |
| Magnetic susceptibility (χ) | -49.4×10^-6 cm³/mol |
| Refractive index (nD) | 1.584 |
| Viscosity | 240 mPa·s (25 °C) |
| Dipole moment | 3.85 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 489.8 J·mol⁻¹·K⁻¹ |
| Std enthalpy of combustion (ΔcH⦵298) | -2024 kJ mol⁻¹ |
| Pharmacology | |
| ATC code | B05CX01 |
| Hazards | |
| Main hazards | Causes serious eye irritation. |
| GHS labelling | GHS05, GHS07 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H302 + H315 + H319 |
| Precautionary statements | P280, P305+P351+P338, P337+P313, P302+P352, P332+P313, P362+P364 |
| NFPA 704 (fire diamond) | 1-0-0-N |
| Lethal dose or concentration | LD₅₀ Oral Rat: >2000 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral Rat 5000mg/kg |
| NIOSH | Not Listed |
| PEL (Permissible) | Not Listed |
| REL (Recommended) | 10 mg/m3 |
| Related compounds | |
| Related compounds |
Sulfonic acids Hydroxysulfonic acids Ethanolamines Benzenecarboxamidines Hexamethyleneglycol bis(oxy) derivatives Ethanesulfonic acid salts Aminoguanidine derivatives |