Deazapurine methylnucleoside derivative, and polynucleotide deriv. [...] deriv.

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PROBLEM TO BE SOLVED : To provide a new fluorescent nucleic acid in which the fluorescence emission wavelength changes due to difference of a surrounding polar environment and which does not destabilize the double-helix structure of DNA even when introduced into DNA, and a probe using the same.SOLUTION : This deazapurine nucleoside derivative is represented by formula (I) or (II) [wherein the ring Aand the ring Aare each a 6-18C aromatic ring; Xand Xare each a carbon-carbon double bond (-C=C-) or carbon-carbon triple bond (-C≡C-); Yand Yare each a 1-10C acyl, 1-10C alkoxycarbonyl, cyano, a halogen atom or the like; m and n are each 0, 1 or 2; Rand Rare each a hydrogen atom or hydroxy].