AIDS-140716 AIDS140716 Benzyl 1-(8-benzyl-2,5,11-triisopropyl-3,6,9,15,15-pentamethyl-4,7,10,13-tetraoxo-14-oxa-3,6,9,12-tetraazahexadec-1-anoyl)-2-pyrrolidinecarboxylate NSC653625