AIDS-028528 AIDS028528 MP-167 N-(2(R),3(S)-Dihydroxy-4(S)-((3-methyl-2(S)-((5-methylpyrazin-2-yl)carbonylamino)butanoylamino)-5-phenyl-1(S)-benzylpentyl)-3-methyl-2(S)-((5-methylpyrazin-2-yl)carbonylamino)butanamide