N-Isobutyryl-3'-O,5'-O-[oxybis(diisopropylsilanediyl)]guanosine
3',5'-O-(1,1,3,3-Tetraisopropyl-1,3-disiloxanediyl)guanosine
N4-Benzoyl-3',5'-O-(1,1,3,3-tetraisopropyl-1,3-disiloxanediyl)cytidine
3',5'-O-[1,1,3,3-Tetrakis(1-methylethyl)-1,3-disiloxanediyl]-Thymidine