pirolate pirolate pirolate (cp-32,387) is an antihistamine drug with a tricyclic chemical structure which was patented as an "antiallergen". it was never marketed and there are very few references to it in the literature. pirolateclinical dataroutes ofadministrationoralatc codenonelegal statuslegal status ? identifiers iupac name ethyl 7,8-dimethoxy-4-oxo-1,4-dihydropyrimidoquinoline-2-carboxylate cas number55149-05-8pubchem cid5361200chemspider4514698unii2lf7l6qd58keggd05508comptox dashboard (epa)dtxsid50203660 chemical and physical dataformulac16h15n3o5molar mass329.312 g·mol−13d model (jsmol)interactive image smiles o=c(occ)c/1=n/c(=o)c2cc3cc(oc)c(oc)cc3nc2n\1