18657-01-7 20370-94-9 28982-57-2 3,4-Dehydroreserpine 3,4-Didehydroreserpine 3-Dehydroreserpine Yohimbanium, 3,4-didehydro-11,17-dimethoxy-16-(methoxycarbonyl)-18-((3,4,5- trimethoxybenzoyl)oxy)-, (16beta,17alpha,18beta,20alpha)