DNA G Phosphoramidite; ibu-dG Phosphoramidite; 5'-O-(4,4'-Dimethoxytrityl)-N2-Isobutyryl-2'-Deoxyguanosine-3'-(2-Cyanoethyl-N,N-Diisopropyl)Phosphoramidite; N2-isobutyryl-deoxyguanosine phosphoramidite; N2-Isobutyryl-5'-O-(4,4'-dimethoxytrityl)-2'-deoxyguanosine-3'-cyanoethyl Phosphoramidite