LCZ696 Impurity 3 Catalogue L524673 CAS 149709-49-9 M.W 411.50 M.F C24H29NO5 Specifications FAQs (2R,4S)-4-([1,1'-Biphenyl]-4-ylmethyl)-4-(4-ethoxy-4- oxobutanamido)-2-methylbutanoic acid