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Nucleosides spin-labelled with isoindoline-derived benzimidazole (ImU) and benzoxazole (OxU) moieties were synthesized and incorporated into DNA oligonucleotides. Both labels display limited mobility in duplex DNA but ImU was less mobile, which was attributed to an intramolecular hydrogen bond between the N–H of the imidazole and O4 of the uracil nucleobase.
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