LCZ696 Impurity 9 Catalogue L524679 CAS 2376611-98-0 M.W 439.54 M.F C26H33NO5 Specifications FAQs Ethyl (2R,4S)-4-([1,1'-biphenyl]-4-ylmethyl)-4-(4-ethoxy-4-oxobutanamido)-2-methylbutanoate