AIDS-188364 AIDS188364 L-Valine, N-[[[(1S)-1-[[(3a'R,6a'S)-1'-(cyclopropylcarbonyl)hexahydro-2'-oxospiro[cyclobutane-1,3'(4'H)-pyrrolo[3,2-b]pyrrol]-4'-yl]carbonyl]-2-methylpropyl]amino]carbonyl]-, methyl ester