(20-alpha)-19,20-Dihydro-3-oxovobasan-17-oic acid methyl ester 20-Epitabernemontanine 2299-26-5 Dregamine EINECS 218-948-0 Methyl (20-alpha)-19,20-dihydro-3-oxovobasan-17-oate Methyl (20alpha)-19,20-dihydro-3-oxovobasan-17-oate NSC 177392 Vobasan-17-oic acid, 19,20-dihydro-3-oxo-, methyl ester, (20-alpha)-