for the following products
5'-O-DMT-2'-O-tert-butyldimethylsilyl-N4-Acetyl-cytidine 3'-CE phosphoramidite | 5'-O-Dmt-2'-tbdms-rc(N-ac)-3'-cedpa | Ac-rC-CE-Phosphoramidite and N-Acetyl-5'-o-(4,4-dimethoxytrityl)-2'-o-[(tert-butyl)dimethylsilyl]cytidine-3'-(2-cyanoethyl-N,N-diisopropyl)phosphoramidite