AIDS-188361 AIDS188361 Spiro[cyclobutane-1,3'(2'H)-pyrrolo[3,2-b]pyrrol]-2'-one, 4',4''-[carbonylbis[imino[(2S)-3-methyl-1-oxo-2,1-butanediyl]]]bis[1'-(cyclopropylcarbonyl)hexahydro-, (3a'R,6a'S,3''''aR,6''''aS)- bis-Valyl trans-lactam