butamben butamben butamben is a local anesthetic. proprietary names includes alvogil in spain and alvogyl in switzerland. it is one of three components in the topical anesthetic cetacaine. butambenclinical dataother namesn-butyl p-aminobenzoateahfs/drugs.commicromedex detailed consumer informationroutes ofadministrationtopicalatc codenoneidentifiers iupac name butyl 4-aminobenzoate cas number94-25-7 ypubchem cid2482chemspider2388 yuniiefw857872qkeggd00730chebichebi:3231chemblchembl127516 ycomptox dashboard (epa)dtxsid7022417 echa infocard100.002.107 chemical and physical dataformulac11h15no2molar mass193.246 g·mol−13d model (jsmol)interactive imagemelting point58 °c (136 °f) smiles o=c(occcc)c1ccc(n)cc1 inchi inchi=1s/c11h15no2/c1-2-3-8-14-11(13)9-4-6-10(12)7-5-9/h4-7h,2-3,8,12h2,1h3 ykey:iuwvalylnvxwkx-uhfffaoysa-n y (verify) chemistry it is the ester of 4-aminobenzoic acid and butanol. a white, odourless, crystalline powder. that is mildly soluble in water (1 part in 7000) and soluble in alcohol, ether, chloroform, fixed oils, and dilute acids. it slowly hydrolyses when boiled with water. synonyms include butamben, butilaminobenzoato, and butoforme. synthesis patents: ~97%: ~94%: ~88%: na: the esterification between 4-nitrobenzoic acid (1) and 1-butanol (2) gives butyl 4-nitrobenzoate (3). bechamp reduction then gives butamben (4). alternatively, 4-aminobenzoic acid can be used directly.