Synonyms: 5,14-Ethanomorphinan-6-one,7,8-didehydro-4-hydroxy-3-methoxy-; 5,14-Ethanothebainone, 17-demethyl- (8CI);17-Demethyl-5,14-ethanothebainone;4,10a-Ethano-10,4a-(iminoethano)phenanthren-3(4H)-one,9,10-dihydro-5-hydroxy-6-methoxy-, [4S-(4a,4aa,10a,10aa)]-; 5,14-Ethanonorthebainone