Synonyms: Vomicine,21a,22a-epoxy-21,22-dihydro- (8CI); 3H,9H-3a,1a-(Ethaniminomethano)indolo[3,2,1-ij]oxireno[5,6]oxepino[2,3,4-de]quinoline,16,19-secostrychnidine-10,16-dione deriv.; 21,22a-Epoxyvomicine; 21a,22a-Epoxy-4-hydroxy-N-methyl-sec-pseudostrychnine