is conjugate base of has functional parent morphinane alkaloid organic heteropentacyclic compound thebaine(1+) oripavine thebaine CHEBI:9519 paramorphine (5R,9R,13S)-4,5-epoxy-3,6-dimethoxy-9alpha-methyl-6,8-morphinadien 3-O-methyl-oripavin Thebaine (5alpha)-6,7,8,14-tetradehydro-4,5-epoxy-3,6-dimethoxy-17-methylmorphinan 4,5alpha-epoxy-3,6-dimethoxy-17-methyl-6,8-morphinadien chebi_ontology