Figure 3.
Three types of nucleoside phosphoramidites are shown: a) 5′-O-DMT–2′-O-TBDMS–3′-O-(2-cyanoethyl-NN, -diisopropyl), b) 5′-O-DMT–2′-O-TOM–3′-O-(2-cyanoethyl-NN, -diisopropyl), and c) 5′-O-DOD–2′-O-ACE–3′-O-(methyl-NN, -diisopropyl) phosphoramidites.