AIDS-188376 AIDS188376 Spiro[cyclobutane-1,3'(2'H)-pyrrolo[3,2-b]pyrrol]-2'-one, 1'-(cyclopropylcarbonyl)hexahydro-4'-[(2S)-3-methyl-1-oxo-2-[[[(2,2,2-trifluoroethyl)amino]carbonyl]amino]butyl]-, (3a'R,6a'S)-