A-500359 E AIDS-169121 AIDS169121 Methyl 6-{[(2S,3S,4R,5R)-5-(2,4-dioxo(1,3-dihydropyrimidinyl))-4-hydroxy-3-methoxyoxolan-2-yl]carbamoylmethoxy}(4S,5S,6S)-4,5-dihydroxy-4H-5,6-dihydropyran-2-carboxylate