has role buprenorphine (5alpha,6beta,14beta,18R)-17-(cyclopropylmethyl)-18-[(2S)-2-hydroxy-3,3-dimethylbutan-2-yl]-6-methoxy-18,19-dihydro-4,5-epoxy-6,14-ethenomorphinan-3-ol A morphinane alkaloid that is 7,8-dihydromorphine 6-O-methyl ether in which positions 6 and 14 are joined by a -CH2CH2- bridge, one of the hydrogens of the N-methyl group is substituted by cyclopropyl, and a hydrogen at position 7 is substituted by a 2-hydroxy-3,3-dimethylbutan-2-yl group. C29H41NO4 CAS:52485-79-7 DrugBank:DB00921 Wikipedia:Buprenorphine [H][C@@]1(C[C@]23CC[C@]1(OC)[C@@H]1Oc4c(O)ccc5C[C@H]2N(CC[C@@]31c45)CC1CC1)[C@](C)(O)C(C)(C)C organic molecular entity opioid analgesic