(6S)-3-[2-(tert-Butyl)-4-(hydroxymethyl)-5-methylphenylthio]-4-hydroxy-6-(methylethyl)-6-(2-pyrimidin-5-ylethyl)-5H-6-hydropyran-2-one 6-Heteroaryl-4-hydroxy-5,6-dihydropyrone deriv AIDS-094299 AIDS094299