AIDS-188374 AIDS188374 Spiro[cyclobutane-1,3'(2'H)-pyrrolo[3,2-b]pyrrol]-2'-one, 4'-[(2S)-2-[[(cyclohexylamino)carbonyl]amino]-3-methyl-1-oxobutyl]-1'-(cyclopropylcarbonyl)hexahydro-, (3a'R,6a'S)-