for the following products
5'-O-DMT-2'-O-iBu-N-Bz-Guanosine | 5'-O-[bis-(4-Methoxyphenyl)phenylmethyl]-2'-o-[(tert-butyl)dimethylsilyl]-n-(2-methyl-1-oxopropyl)guanosine | N-(9-((2R,3R,4R,5R)-5-((bis-(4-Methoxyphenyl)(phenyl)methoxy)methyl)-3-((tert-butyldimethylsilyl)oxy)-4-hydroxytetrahydrofuran-2-yl)-6-oxo-6,9-dihydro-1H-purin-2-yl)isobutyramide | N2-isobutyryl-2''-O-(tert-butyldimethylsilyl)-5''-O-(4,4''-dimethoxytrityl)-gu | N2-isobutyryl-5'-O-(4,4'-dimethoxytrityl)-2'-O-(tert-butyl-dimethylsilyl)-guanosine and 5'-Dmt-2'-tbdms-ibu-rg
