.psi.-Yohimbine 3.beta.-Yohimban-16.alpha.-carboxylic acid, 17.alpha.-hydroxy-, methyl ester 84-37-7 NSC72116 PSEUDOYOHIMBINE Yohimban-16-carboxylic acid, 17-hydroxy-, methyl ester, (3.beta.,16.alpha.,17.alpha.)-