11-Methoxyajmalicine 482-94-0 EINECS 207-587-4 Methyl (19alpha)-16,17-didehydro-11-methoxy-19-methyloxayohimban-16-carboxylate Oxayohimban-16-carboxylic acid, 16,17-didehydro-11-methoxy-19-methyl-, methyl ester, (19alpha)-