4-Hydroxy-5,6-dihydropyranone deriv. AIDS-059156 AIDS059156 N-[3-[1(R or S)-(4-Hydroxy-2-oxo-6(R or S)-(4-fluorophenyl)ethyl)-6-n-propyl-5,6-dihydro-2H-pyran-3-yl)-2,2-dimethylpropyl]-phenyl]-5-cyanopyridine-2-sulfonamide