Valsartan Isoleucine impurity of CBM CAS No. : 137863-88-8Molecular Formula: C21H24N2O2Molecular Weight : 336.43Chemical Name : N-((2′-cyanobiphenyl-4-yl)methyl)-L-isoleucine methyl ester Butyryl valsartan impurity CAS No. : 952652-79-8Molecular Formula: C23H27N5O3Molecular Weight : 421.49Chemical Name : (S)-N-butyryl-N-{[2’-(1H-tetrazole-5-yl)-biphenyl-4-yl]-methyl} valine