Category: Active Pharmaceutical Ingredient ( API) CAS No: [ 50-55-5] Chemical Name: ( 3² , 16² , 17± , 18² , 20± ) -11, 17-Dimethoxy-18-[ ( 3, 4, 5-trimethoxybenzoyl) oxy] -yohim ban-16-carboxylic acid methyl ester. Other Name: • Rivasin • Serpasil Pharmacopoeial Reference: USP Molecular Weight: 608.68 Molecular Formula: C33H40N2 O9