AIDS-089203 AIDS089203 MDL 74,538 MDL 74538 MDL74538 N-{(1R)-2-Methyl-1-[(phenylmethoxy)methyl]propyl}-4-{(2S)-3-methyl-2-[(phenylmethoxy)carbonylamino]butanoylamino}-2,2-difluoro-3-oxo-5-[4-(phenylmethoxy)phenyl]pentanamide