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Preparation of 2′-O-(allyloxycarbonyl)methyluridine 3′-phosphoramidite (7). Abbreviations: TIPS - 1,1,3,3-tetraisopropyldisiloxan- 1,3-diyl, Pom - pivaloyloxymethyl, TBAHS - tetra-n-butylammonium hydrogen sulfate, BTPP - phosphazene base P1-tert-butyltris(tetramethylene), DMTr - 4,4′-dimethoxytrityl.
