for the following products
5'-O-DMT-N2-isobutyryl-2'-O-methyl-D-guanosine | N-(9-((2R,3R,4R,5R)-5-((bis-(4-Methoxyphenyl)(phenyl)methoxy)methyl)-4-hydroxy-3-methoxytetrahydrofuran-2-yl)-6-oxo-6,9-dihydro-1H-purin-2-yl)isobutyramide | N2-isobutyryl-5'-O-(4, 4'-dimethoxytrityl)-2'-O-methyl-Guanosine and 5'-O-DMT-N2-isobutyryl-2'-O-methylguanosine
