AIDS-188366 AIDS188366 Spiro[cyclobutane-1,3'(2'H)-pyrrolo[3,2-b]pyrrol]-2'-one, 1'-(cyclopropylcarbonyl)hexahydro-4'-[(2S)-3-methyl-2-[[[[(1S)-2-methyl-1-[[4-(2-pyrimidinyl)-1-piperazinyl]carbonyl]propyl]amino]carbonyl]amino]-1-oxobutyl]-, (3a'R,6a'S)-