(5S)-5-((2S)-2-{(2S)-2-[(2S)-2-((2S)-2-Amino-3-carboxypropanoylamino)-4-carboxybutanoylamino]-3,3-diphenylpropanoylamino}-3-carboxypropanoylamino)-3-amino-3-(3,3-difluoropropyl)-6-cyclohexyl-2,4-dioxohexanoic acid AIDS-105129 AIDS105129 Ac-D-E-Dif-D-Cha-Dfab-COCO2H