3 - deazapurine nucleoside derivatives, 3 - [...] derivative polynucleotide derivatives

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PROBLEM TO BE SOLVED : To provide a probe that makes it possible to monitor micro environments in a living body with a new concept different from conventional ones.SOLUTION : Used is a 3-deazapurine nucleoside derivative represented by the following formula (I) or (II), where Rand Rare independent of each other, the same or different from each other, and represent a condensed ring such as a 1-naphthyl group or a 2-naphthyl group, and Rand Rare independent of each other, the same or different from each other, and represent a hydrogen atom or a hydroxy group.