Synonyms: Oxonareline;Spiro[5H-1,4-epoxy-2,7-methano-2H-3,1-benzoxazine-5,3'-[3H]indole]-6-carboxylicacid, 8-ethylidene-1',2',4,4a,6,7,8,8a-octahydro-2'-oxo-, methyl ester, [1S-(1a,2b,4a,4aa,5b,6a,7b,8E,8aa)]-; [1S-(1a,2b,4a,4aa,5b,6a,7b,8E,8aa)]-Methyl8-ethylidene-1',2',4,4a,6,7,8,8a-octahydro-2'-oxospiro[5H-1,4-epoxy-2,7-methano-2H-3,1-benzoxazine-5,3'-[3H]indole]-6-carboxylate