bis<(pivaloyloxy)methyl> phosphate silver salt 、
3'-O-acetyl-2',5'-dideoxy-5'-iodo-5-fluorouridine 生成 [[(2S,3S,5R)-3-acetyloxy-5-(5-fluoro-2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy-(2,2-dimethylpropanoyloxymethoxy)phosphoryl]oxymethyl 2,2-dimethylpropanoate