Category: Active Pharmaceutical Ingredient ( API) CAS No: [ 65-19-0] Chemical Name: ( 16± , 17± ) -17-Hydroxy-yohimban-16-carboxylic acid methyl ester. Other Name: � Antagonil � Aphrodyne � Erex � Yovital Pharmacopoeial Reference: USP Molecular Weight: 390.90 Molecular Formula: C21H26 N2 O3. HCl