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An expansion of H2O NOESY spectra of (A) 1 and (B) 2 in the aromatic to imino proton region. Dashed vertical lines, the positions of the resonances of the H2 and H4 protons of the adenine and 3-nitropyrrole residues; dashed horizontal lines, the positions of the resonances of the imino protons of the cytosine and guanine residues; solid arrows, interstrand cross peaks observed in the spectra.
