3,6,10,13,16-Pentaazaeicosane-1,20-dioic acid, 19-[(2E)-2-butenyl]-15-cyclohexyl-12-(2-methylpropyl)-4,7,8,11,14,17-hexaoxo-2-phenyl-9-propyl-, 1-(phenylmethyl) ester, (2S,12S,15S)- AIDS-115608 AIDS115608