Synonyms: (20α)-3,5,6,16,17-Pentadehydro-16-(methoxycarbonyl)-19α-methyl-18-oxayohimban-4-ium;(19alpha,20alpha)-3,4,5,6,16,17-Hexadehydro-16-(methoxycarbonyl)-19-methyloxayohimbanium;Oxayohimbanium, 3,4,5,6,16,17-hexadehydro-16-(methoxycarbonyl)-19-methyl-, (19alpha,20alpha)-