(2S)-N-(3-{(2S)-2-[N-(tert-butyl)carbamoyl]-4,4-difluoropyrrolidinyl}(1S,2S)-2-hydroxy-3-oxo-1-benzylpropyl)-3-carbamoyl-2-[(phenylmethoxy)carbonylamino]propanamide AIDS-080388 AIDS080388 Z-Asn-(2S,3S)-AHPBA-[4,4-difluoro]Pro t-butylamine