Synonyms: Vobtusine,2'-deoxy-2',22'-epoxy-, (22'b)-; Quimbeline; Spiro[5,12c-epoxy-4H,12cH,15aH,16H-furo[2',3':7,8]indolizino[8,1-cd]pyrido[1,2,3-lm]carbazole-6(7H),2'(2'aH)-[1H,15aH]furo[2',3':7,8]indolizino[8,1-cd]carbazole]-7'-carboxylicacid, 2,3,4',4a,5,5',6',8',13,13',14,14',17,17a-tetradecahydro-9-methoxy-,methyl ester, [4aS-[3aS*,4aa,5b,6b(2'aS*,5'aS*,12'bS*,15'aS*),12bS*,12cb,15aa,17ab]]-