quazinone quazinone quazinone (dozonone) is a cardiotonic and vasodilator drug which was developed and marketed in the 1980s for the treatment of heart disease. it acts as a selective pde3 inhibitor. it is no longer available. quazinoneclinical dataother namesro 13-6438routes ofadministrationoralatc codenonelegal statuslegal status in general: ℞ (prescription only) identifiers iupac name (3r)-6-chloro-3-methyl-5,10-dihydroimidazoquinazolin-2(3h)-one cas number70018-51-8pubchem cid6603980chemspider5036286uniid1q7f6c2fpkeggd05668comptox dashboard (epa)dtxsid6045795 chemical and physical dataformulac11h10cln3omolar mass235.67 g·mol−13d model (jsmol)interactive image smiles clc1cccc3c1cn2/c(=n\c(=o)2c)n3