| abstract |
The present invention provides novel nucleoside derivatives or salts thereof, reagents for synthesizing polynucleotides, methods for producing polynucleotides, polynucleotides, and methods for producing binding nucleic acid molecules. The nucleoside derivative or salt thereof of the present invention is characterized by being represented by the chemical formula (1). In the chemical formula (1), Su is an atomic group having a sugar backbone in a nucleoside residue or an atomic group having a sugar phosphate backbone in a nucleotide residue, with or without a protecting group, L 1 and L 2 Each independently is a linear or branched saturated or unsaturated hydrocarbon group with 2 to 10 carbon atoms, X 1 and X 2 are each independently an imino group (-NR 1 -), an ether group (-O-) or In the thioether group (-S-), R 1 is a hydrogen atom or a linear or branched saturated or unsaturated hydrocarbon group having 2 to 10 carbon atoms. |