Synonyms: 3,4,5,6,16,17-Hexadehydro-16-(methoxycarbonyl)-19alpha-methyloxayohimbanium, salt with (R-(R*,R*))-tartaric acid (1:1);Oxayohimbanium, 3,4,5,6,16,17-hexadehydro-16-(methoxycarbonyl)-19-methyl-, (19alpha)-, salt with (R-(R*,R*))-2,3-dihydroxybutanedioic acid (1:1);Serpentine hydrogen tartrate;Butanedioic acid, 2,3-dihydroxy-(R-(R*,R*))-, ion(1-), (19alpha)-3,4,5,6,16,17-hexadehydro-16-(methoxycarbonyl)-19-methyloxayohimbanium;3,4,5,6,16,17-hexadehydro-16-(methoxycarbonyl)-19α-methyloxayohimbanium, salt with [R-(R*,R*)]-tartaric acid (1:1);Oxayohimbanium, 3,4,5,6,16,17-hexadehydro-16-(methoxycarbonyl)-19-methyl-, (19alpha)-, salt with (2R,3R)-2,3-dihydroxybutanedioic acid (1:1);Butanedioic acid, 2,3-dihydroxy- (2R,3R)-, ion(1-), (19alpha)-3,4,5,6,16,17-hexadehydro-16-(methoxycarbonyl)-19-methyloxayohimbanium;