for the following products
2'-O-tert-Butyldimethylsilyl-N-(tert-butylphenoxyacetyl)-5'-O-dmt-guanosine 3'-ce phosphoramidite and 5'-O-(4,4-Dimethoxytrityl)-2'-o-[(tert-butyl)dimethylsilyl]-N-[[4-(tert-butyl)phenoxy]acetyl]guanosine-3'-(2-cyanoethyl-N,N-diisopropyl)phosphoramidite