9-((5-Aminopentanoyl)amino)-18,27,36,45-tetrakis(4-(((benzyloxy)carbonyl)amino)butyl)-3,10,16,19,25,28,34,37,43-nonaoxo-1-phenyl-2-oxa-4,11,17,20,26,29,35,38,44-nonaazahexatetracontan-46-oic acid AIDS-126499 AIDS126499 NSC112955