4-Hydroxy-5,6-dihydropyranone deriv. AIDS-059155 AIDS059155 N-[3-(R or S)-[1-(4-hydroxy-2-oxo-6,6-bis(2-phenylethyl)-5,6-dihydro-2H-pyran-3-yl)-2,2-dimethylpropyl]-phenyl]-1-methyl-1H-imidazole-4-sulfonamide