AIDS-169471 AIDS169471 Urea, N-[(1S)-1-[[(3aS,6aR)-6-cyclobutyl-4-(cyclopropylcarbonyl)hexahydro-5-oxopyrrolo[3,2-b]pyrrol-1(2H)-yl]carbonyl]-2-methylpropyl]-N'-(4-pyridinylmethyl)-