AIDS-169473 AIDS169473 L-Valine, N-[[[(1S)-1-[[(3aS,6aR)-6-cyclobutyl-4-(cyclopropylcarbonyl)hexahydro-5-oxopyrrolo[3,2-b]pyrrol-1(2H)-yl]carbonyl]-2-methylpropyl]amino]carbonyl]-, ethyl ester