| abstract |
The present invention provides an oligonucleotide having improved affinity for AG02, and the like. The oligonucleotide has a nucleotide residue or a nucleoside residue represented by formula (I) {wherein X 1 is an oxygen atom or the like, R 1 is formula (IIA) (wherein R 5A is halogen or the like, and R 6A is a hydrogen atom or the like) or formula (IVA) (wherein Y 3A is a nitrogen atom or the like, and Y 4A is CH or the like), or the like, R 2 is a hydrogen atom, hydroxy, halogen, or optionally substituted lower alkoxy, and R 3 is a hydrogen atom or the like} at the 5' end thereof, and the nucleotide residue or the nucleoside residue binds to an adjacent nucleotide residue through the oxygen atom at position 3. |