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Nucleoside derivatives or salts thereof, 5'-phosphate esters of nucleoside derivatives or salts thereof, 3'-phosphoramidites of nucleoside derivatives or salts thereof, and polynucleotides
Nucleoside derivatives or salts thereof, 5'-phosphate esters of nucleoside derivatives or salts thereof, 3'-phosphoramidites of nucleoside derivatives or salts thereof, and polynucleotides
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机译：核苷衍生物或其盐，核苷衍生物或其盐的5'-磷酸酯，核苷衍生物或其盐的3'-亚磷酰胺和多核苷酸
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摘要
in the formulae (I-1) to (I-6), R1 to R5, A1 to A3, B, X, Y, and k represent the meanings as described in claim 1.
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