Synonyms: 2,6(7H)-Cyclo-6,7-secocorynan-16-carboxylicacid, 16,17-didehydro-17-methoxy-7-oxo-, methyl ester, (16E)-; Corynantheinepseudoindoxyl, dihydro-; Dihydrocorynantheine pseudoindoxyl;Spiro[2H-indole-2,1'(5'H)-indolizine]-7'-acetic acid, 6'-ethyl-1,2',3,3',6',7',8',8'a-octahydro-a-(methoxymethylene)-3-oxo-,methyl ester, [6'R,7'S(E),8'aS]-[partial]-