for the following products
N-Benzoyl-5'-o-[bis(4-methoxyphenyl)phenylmethyl]-2'-o-(2-methoxyethyl)-5-methylcytidine | N4-benzoyl-5'-O-(4,4'-dimethoxytrityl)-2'-O-(2-methoxyethyl)-5-methylcytidine and N-Benzoyl-5'-O-dmtr-2'-O-(2-methoxyethyl)-5-methyl cytidine
