(S)-2-((S)-2-{(2R,4S,5S)-5-[(S)-2-((S)-2-Benzyloxycarbonylamino-propanoylamino)-propanoylamino]-4-hydroxy-2-isobutyl-6-phenyl-hexanoylamino}-3-methyl-butanoylamino)-3-methyl-butyric acid methyl ester AIDS-050855 AIDS050855 Hydroxyethylene isostere