LCZ696 Impurity 4 Catalogue L524674 CAS N/A M.W 409.48 M.F C24H27NO5 Specifications FAQs (Z)-4-(((2S,4R)-1-([1,1'-biphenyl]-4-yl)-5-ethoxy-4-methyl-5- oxopentan-2-yl)amino)-4-oxobut-2-enoic acid