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Comparison of one‐ and two‐dimensional techniques in the unambiguous 13C NMR spectral assignment of ellipticine and related indole derivatives

The 13C NMR spectra of several indole derivatives have been completely assigned by reverse detected one‐bond and long‐range CH correlation spectra (HMQC) and by selective INEPT experiments. The resolution and sensitivity of the two techniques are discussed. As a result, the literature assignments for the previously known compounds have been revised.