AIDS-144925 AIDS144925 NSC668450 Triethyl 24-(((benzyloxy)carbonyl)amino)-6,9,18,21-tetrakis(3-ethoxy-3-oxopropyl)-5,8,11,14,17,20,23-heptaoxo-4,7,10,13,16,19,22-heptaazahexacosane-1,3,26-tricarboxylate