5'-O-(monomethoxytrityl)guanosine 、
1-methyl-3-[2-(4-nitrophenyl)ethoxycarbonyl]imidazolium chloride 生成 [(2R,3R,4R,5R)-2-(2-amino-6-oxo-3H-purin-9-yl)-5-[[(4-methoxyphenyl)-diphenylmethoxy]methyl]-4-[2-(4-nitrophenyl)ethoxycarbonyloxy]oxolan-3-yl] 2-(4-nitrophenyl)ethyl carbonate