3.beta.,20.alpha.-Yohimban-16.beta.-carboxylic acid, 18.beta.-hydroxy-11,17.alpha.-dimethoxy- 83-60-3 NSC81463 Reserpic acid Reserpinolic acid Yohimban-16-carboxylic acid, 18-hydroxy-11,17-dimethoxy-, (3.beta.,16.beta.,17.alpha.,18.beta.,20.alpha.)-