上游原料
(2R,3R,4R,5S)-4,5-bis(acetoxy)-2-[(acetoxy)methyl]tetrahydro-3-furanyl acetate5-fluoro-N-(trimethylsilyl)-2-[(trimethylsilyl)oxy]-4-pyrimidinamine; N-[5-fluoro-2-[(trimethylsilyl)oxy]-4-pyrimidinyl]-N-(trimethylsilyl)amine3-[(chlorocarbonyl)oxy]-1-propene(2R,3R,4R,5R)-4-(acetyloxy)-2-[(acetyloxy)methyl]-5-[4-amino-5-fluoro-2-oxo-1(2H)-pyrimidinyl]tetrahydro-3-furanyl acetate(2R,3R,4R,5R)-4-(acetyloxy)-2-[(acetyloxy)methyl]-5-[4-{[(allyloxy)carbonyl]amino}-5-fluoro-2-oxo-1(2H)-pyrimidinyl]tetrahydro-3-furanyl acetateallyl 1-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydro-2-furanyl]-5-fluoro-2-oxo-1,2-dihydro-4-pyrimidinylcarbamate
