上游原料
[(2R,3S,5R)-3-[(2-chloroacetyl)oxy]-5-[5-fluoro-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]tetrahydro-2-furanyl]methyl 2-chloroacetate1,3-benzodioxole-5-carbonyl chloride(2R,3S,5R)-5-[3-(1,3-benzodioxol-5-ylcarbonyl)-5-fluoro-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl]-2-[[(2-chloroacetyl)oxy]methyl]tetrahydro-3-furanyl 2-chloroacetate
