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Expansions of (A) D2O NOESY and (B) 2QF-COSY spectra of 1 and of a (C) D2O NOESY spectrum of 2. In the NOESY spectra: solid lines, uninterrupted connectivities of residues 1–9; dashed lines, uninterrupted connectivities of residues 10–18. Dotted lines, adenine H2 and 3-nitropyrrole H2, H4 and H5 chemical shifts. Inset, 1-(2′-deoxy-β-d-ribofuranosyl)-3-nitropyrrole in the syn conformation.
