3',3'-butadiynediyl-[(2,5-di-O-(tert-butyldimethylsilyl)-β-D-ribofuranosyl)-uracil]-[(2-O-(tert-butyldimethylsilyl)-β-D-ribofuranosyl)-adenine]

9-[3-C-ethynyl-2-O-[phenoxy(thiocarbonyl)]-3,5-O-(1,1,3,3-tetraisopropyldisiloxane-1,3-diyl)-β-D-ribo-pentofuranosyl]adenine

9-(5-O-benzoyl-3-C-ethynyl-β-D-ribo-pentofuranosyl)adenine

9-(3-C-ethynyl-2-deoxy-β-D-erythro-pentofuranosyl)adenine

9-[3-C-ethynyl-3,5-O-(1,1,3,3-tetraisopropyldisiloxane-1,3-diyl)-2-deoxy-β-D-erythro-pentofuranosyl]adenine