NUCLEOSIDE DERIVATIVE OR SALT THEREOF, POLYNUCLEOTIDE SYNTHESIS REAGENT, METHOD FOR PRODUCING POLYNUCLEOTIDE, POLYNUCLEOTIDE, AND METHOD FOR PRODUCING BINDING NUCLEIC ACID MOLECULE
NUCLEOSIDE DERIVATIVE OR SALT THEREOF, POLYNUCLEOTIDE SYNTHESIS REAGENT, METHOD FOR PRODUCING POLYNUCLEOTIDE, POLYNUCLEOTIDE, AND METHOD FOR PRODUCING BINDING NUCLEIC ACID MOLECULE