4OH-Pyran2one, PyridCH2CONH deriv. AIDS-028336 AIDS028336 [3-[[3-[Cyclopropyl[4-hydroxy-2-oxo-6-[1-(phenylmethyl)propyl]-2H-pyran-3-yl]methyl]phenyl]amino]1(S)-[1H-imidazol-4-yl)methyl]-2-oxoethyl]carbamic acid