(19-alpha)-16,17-Didehydro-1,19-dimethyloxayohimban-16-carboxylic acid hydrazide 72442-35-4 N(sub 1)-Methylraubasinique acide hydrazide [French] Oxayohimban-16-carboxylic acid, 16,17-didehydro-1,19-dimethyl-, hydrazide, (19-alpha)-