6-{[(2S,3S,4R,5R)-5-(2,4-Dioxo(1,3-dihydropyrimidinyl))-3,4-dihydroxyoxolan-2-yl]carbamoylmethoxy}(4S,5S,6S)-4,5-dihydroxy-4H-5,6-dihydropyran-2-carboxylic acid A-500359 H AIDS-169123 AIDS169123