ozolinone ozolinone ozolinone is a loop diuretic which was never marketed. ozolinoneclinical dataroutes ofadministrationoralatc codenonelegal statuslegal status in general: uncontrolled identifiers iupac name (2z)-2-(3-methyl-4-oxo-5-piperidin-1-yl-1,3-thiazolidin-2-ylidene)acetic acid cas number56784-39-5pubchem cid6436036chemspider23253355unii55tit7j81dkeggd05323echa infocard100.054.876 chemical and physical dataformulac11h16n2o3smolar mass256.32 g·mol−13d model (jsmol)interactive image smiles o=c(o)/c=c1/n(c)c(=o)c(s1)n2ccccc2 it is an active metabolite of etozoline.