3'-methylchlorophosphite of 5'-monomethoxytrityl-2'-TBDMS-N-benzoylcytidine 生成 Phosphoric acid (2R,3S,4R,5R)-5-(4-amino-2-oxo-2H-pyrimidin-1-yl)-4-hydroxy-2-hydroxymethyl-tetrahydro-furan-3-yl ester (2R,3S,4R,5R)-5-(6-amino-purin-9-yl)-3,4-dihydroxy-tetrahydro-furan-2-ylmethyl ester methyl ester