LCZ696 Impurity 2 Catalogue L524672 CAS 1012341-48-8 M.W 381.47 M.F C23H27NO4 Specifications FAQs (R,E)-5-([1,1'-biphenyl]-4-yl)-4-((tert-butoxycarbonyl)amino)-2- methylpent-2-enoic acid