2-[(Z)-[(5-[(2R,3S)-3-([(3R,3aS,6aR or 3S,3aR,6aS)-Hexahydrofuro [2,3-b] furan-3-yloxy] carbonylamino)-2-hydroxy-4-phenylbutyl][(4-methoxyphenyl) sulfonyl] amino-4,4-dimethylpentyl) amino](methhoxy)methylidene]-1-hydroxy-1-oxohydrazinium AIDS-095493 AIDS095493