2,3-丁二酮 、
5'-O-(3'-O-acetylthymidyl) 3'-O-(5'-O-acetyl-1',2'-dideoxyribosyl) methyl phosphite 生成 [(2R,3S)-3-[[2-[[(2R,3S,5R)-3-acetyloxy-5-(5-methyl-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy]-2-methoxy-4,5-dimethyl-1,3,2λ5-dioxaphosphol-2-yl]oxy]oxolan-2-yl]methyl acetate