LCZ696 Impurity 11 Catalogue L524681 CAS 149709-60-4 M.W 411.53 M.F C25H33NO4 Specifications FAQs Ethyl (2R,4S)-4-([1,1'-biphenyl]-4-ylmethyl)-4-[(tert-butoxycarbonyl)amino]-2-methylbutanoate