arsanilic acid arsanilic acid arsanilic acid, also known as aminophenyl arsenic acid or aminophenyl arsonic acid, is an organoarsenic compound, an amino derivative of phenylarsonic acid whose amine group is in the 4-position. a crystalline powder introduced medically in the late 19th century as atoxyl, its sodium salt was used by injection in the early 20th century as the first organic arsenical drug, but it was soon found prohibitively toxic for human use. arsanilic acid names preferred iupac name (4-aminophenyl)arsonic acid other names 4-aminobenzenearsonic acid, 4-aminophenylarsonic acid, 4-arsanilic acid, atoxyl identifiers cas number 98-50-0 y 3d model (jsmol) interactive imagezwitterion: interactive image beilstein reference 1102334 chebi chebi:49477 y chembl chembl351769 y chemspider 7111 y drugbank db03006 y echa infocard 100.002.432 ec number 202-674-3 gmelin reference 406354 pubchem cid 7389 unii udx9aks7gm y comptox dashboard (epa) dtxsid8035138 inchi inchi=1s/c6h8asno3/c8-6-3-1-5(2-4-6)7(9,10)11/h1-4h,8h2,(h2,9,10,11) ykey: xknkhvgwjdpirj-uhfffaoysa-n yinchi=1/c6h8asno3/c8-6-3-1-5(2-4-6)7(9,10)11/h1-4h,8h2,(h2,9,10,11)key: xknkhvgwjdpirj-uhfffaoyaq smiles o=(o)(o)c1ccc(n)cc1zwitterion: o=()(o)c1ccc()cc1 properties chemical formula c6h8asno3 molar mass 217.054 g/mol appearance white solid density 1.957 g/cm3 melting point 232 °c (450 °f; 505 k) solubility in water modest hazards occupational safety and health (ohs/osh): main hazards toxic ghs labelling: pictograms signal word danger hazard statements h301, h331, h410 nfpa 704 (fire diamond) 2 0 0 related compounds related compounds phenylarsonic acid except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references arsanilic acid saw long use as a veterinary feed additive promoting growth and to prevent or treat dysentery in poultry and swine. in 2013, its approval by us government as an animal drug was voluntarily withdrawn by its sponsors. still sometimes used in laboratories, arsanilic acid's legacy is principally through its influence on paul ehrlich in launching the antimicrobial chemotherapy approach to treating infectious diseases of humans. chemistry synthesis was first reported in 1863 by antoine béchamp and became the basis of the bechamp reaction. the process involves the reaction of aniline and arsenic acid via an electrophilic aromatic substitution reaction. c6h5nh2 + h3aso4 → h2o3asc6h4nh2 + h2o arsanilic acid occurs as a zwitterion, h3n+c6h4aso3h−, yet is typically represented with the non-zwitterionic formula h2nc6h4aso3h2. history roots and synthesis since at least 2000 bc, arsenic and inorganic arsenical compounds were both medicine and poison. in the 19th century, inorganic arsenicals became the preeminent medicines, for instance fowler's solution, against diverse diseases. in 1859, in france, while developing aniline dyes, antoine béchamp synthesized a chemical that he identified, if incorrectly, as arsenic acid anilide. also biologist, physician, and pharmacist, béchamp reported it 40 to 50 times less toxic as a drug than arsenic acid, and named it atoxyl, the first organic arsenical drug. medical influence in 1905, in britain, h w thomas and a breinl reported successful treatment of trypanosomiasis in animals by atoxyl, and recommended high doses, given continuously, for human trypanosomiasis (sleeping sickness). by 1907, more successful and less toxic than inorganic arsenicals, atoxyl was expected to greatly aid expansion of british colonization of africa and stem loss of cattle in africa and india. (so socioeconomically valuable was colonial medicine that in 1922, german company bayer offered to reveal the formula of bayer 205—developed in 1917 and showing success on sleeping sickness in british and belgian africa—to the british government for return of german colonies lost via world war i.) soon, however, robert koch found through an atoxyl trial in german east africa that some 2% of patients were blinded via atrophy of the optic nerve. in germany, paul ehrlich inferred béchamp's report of atoxyl's structure incorrect, and ehrlich with his chief organic chemist alfred bertheim found its correct structure—aminophenyl arsenic acid or aminophenyl arsonic acid—which suggested possible derivatives. ehrlich asked bertheim to synthesize two types of atoxyl derivatives: arsenoxides and arsenobenzenes. ehrlich and bertheim's 606th arsenobenzene, synthesized in 1907, was arsphenamine, found ineffective against trypanosomes, but found in 1909 by ehrlich and bacteriologist sahachiro hata effective against the microorganism involved in syphilis, a disease roughly equivalent then to today's aids. the company farbwerke hoechst marketed arsphenamine as the drug salvarsan, "the arsenic that saves". its specificity of action fit ehrlich's silver bullet or magic bullet paradigm of treatment, and ehrlich won international fame while salvarsan's success—the first particularly effective syphilis treatment—established the chemotherapy enterprise. in the late 1940s, salvarsan was replaced in most regions by penicillin, yet organic arsenicals remained in use for trypanosomiasis. contemporary usage arsanilic acid gained use as a feed additive for poultry and swine to promote growth and prevent or treat dysentery. for poultry and swine, arsanilic acid was among four arsenical veterinary drugs, along with carbarsone, nitarsone, roxarsone, approved by the u.s. food and drug administration (fda). in 2013, the fda denied petitions by the center for food safety and by the institute for agriculture and trade policy seeking revocation of approvals of the arsenical animal drugs, but the drugs' sponsors voluntarily requested the fda to withdraw approvals of three, including arsanilic acid, leaving only nitarsone approved. in 2015, the fda withdrew nitarsone's approval. arsanilic acid is still used in the laboratory, for instance in recent modification of nanoparticles. it is a reagent for the detection of nitrite in urinalysis dipsticks. citations burke et (1925). 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