(19-alpha,20-alpha)-16,17-Didehydro-19-methyloxayohimban-16-carboxylic acid hydrazide 72407-35-3 Oxayohimban-16-carboxylic acid, 16,17-didehydro-19-methyl-, hydrazide, (19-alpha,20-alpha)- Tetrahydroalstonique acide hydrazide [French]