meseclazone meseclazone meseclazone (w-2395), also known as 2-methylseclazone, is a nonsteroidal anti-inflammatory drug (nsaid) developed in the 1970s. it functions as a prodrug to the 5-chloro derivative of salicyclic acid. it was never marketed on account of toxicity issues, namely pertaining to the liver. meseclazoneclinical dataroutes ofadministrationoralatc codenonelegal statuslegal status in general: uncontrolled identifiers iupac name 7-chloro-2-methyl-3,3a-dihydro-2h,9h-oxazolobenzoxazin-9-one cas number29053-27-8pubchem cid34445chemspider31698unii51kft71thgkeggd04941chemblchembl2104738chemical and physical dataformulac11h10clno3molar mass239.66 g·mol−13d model (jsmol)interactive image smiles clc2cc1c(=o)n3oc(cc3oc1cc2)c