Pregna-4,9(11)-diene-7,21-dicarboxylic acid,17-hydroxy-3-oxo,g-lactone,methyl, CAS 95716-70-4, Ability 400kg/ ... impurity 5.0%max Single impurity 3.0%max AssayHPLC 94.0%~101.0% Pregna-4,9(11)-diene-7,21-dicarboxylic acid ... ,17-hydroxy-3-oxo,g-lactone,methyl ester