AIDS-188368 AIDS188368 Spiro[cyclobutane-1,3'(2'H)-pyrrolo[3,2-b]pyrrol]-2'-one, 1'-(cyclopropylcarbonyl)-4'-[(2S)-2-[[(ethylamino)carbonyl]amino]-3-methyl-1-oxobutyl]hexahydro-, (3a'R,6a'S)-