4-Hydroxy-5,6-dihydropyranone deriv. AIDS-059153 AIDS059153 N-[3-[1(R or S)-(4-Hydroxy-2-oxo-6-n-propyl-6(R or S)-phenethyl-5,6-dihydro-2H-pyran-3-yl)-propyl]-phenyl]-1-methyl-1H-imidazole-4-sulfonamide