2-Pyrrolidinecarboxamide, N-[(1S)-3,3-difluoro-1-[[[2-[4-(2H-tetrazol-5-yl)phenyl]ethyl]amino]carbonyl]propyl]-1-[(2S)-2-hydroxy-3-methyl-1-oxobutyl]-4-phenyl-, (2S,4S)- AIDS-171139 AIDS171139