109460-90-4 14-(4-Nitrobenzoyloxy)yohimbine 14-Nbo-yohimbine 14beta-(4-Nitrobenzoyloxy)yohimbine Yohimban-16-carboxylic acid, 17-hydroxy-14-((4-nitrobenzoyl)oxy)-, methyl ester, (14beta,16alpha,17alpha)-