pirquinozol pirquinozol pirquinozol (sq-13,847) is a drug which was investigated as an antiallergen and antiasthmatic agent in the early 1980s but was never marketed. notably, pirquinozol is not an antihistamine, though it does block the release of histamine evoked by allergens, and it does not bind to β-adrenergic receptors either. pirquinozolclinical dataroutes ofadministrationoralatc codenonelegal statuslegal status in general: uncontrolled identifiers iupac name 2-(hydroxymethyl)pyrazoloquinazolin-5(6h)-one cas number65950-99-4pubchem cid47783chemspider11317704uniid16hg4v2uckeggd05516comptox dashboard (epa)dtxsid00984432 chemical and physical dataformulac11h9n3o2molar mass215.212 g·mol−13d model (jsmol)interactive image smiles occ1cc2c3ccccc3nc(=o)n2n1