LCZ696 Impurity 1 Catalogue L524671 CAS 2216755-67-6 M.W 467.61 M.F C28H37NO5 Specifications FAQs Propan-2-yl (2R,4S)-4-([1,1'-biphenyl]-4-ylmethyl)-2-methyl-4- [4-(propan-2-yloxy)-4-oxobutanamido]butanoate