pirprofen pirprofen pirprofen was a nonsteroidal anti-inflammatory drug (nsaid) that was brought to market by ciba-geigy in 1982 as a treatment for arthritis and pain. its label was restricted after adverse events arose, including some cases of fatal liver toxicity. ciba-geigy voluntarily withdrew the drug from the market worldwide in 1990.: 223 pirprofenclinical dataatc codem01ae08 (who) identifiers iupac name 2-propanoic acid cas number31793-07-4 npubchem cid35935chemspider33051 yuniit7kn291890keggd05515 ychemblchembl188952 ycomptox dashboard (epa)dtxsid7023489 echa infocard100.046.172 chemical and physical dataformulac13h14clno2molar mass251.71 g·mol−13d model (jsmol)interactive image smiles o=c(o)c(c1cc(cl)c(cc1)n2c/c=c\c2)c inchi inchi=1s/c13h14clno2/c1-9(13(16)17)10-4-5-12(11(14)8-10)15-6-2-3-7-15/h2-5,8-9h,6-7h2,1h3,(h,16,17) ykey:pidszxpfgcurgn-uhfffaoysa-n y ny (what is this?) (verify)