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There has been considerable interest over the past decade in the utilization of direct and longrange 1H15N heteronuclear shift correlation methods at natural abundance to facilitate the elucidation of small molecule structures. Recently, there has also been a high level of interest in the exploration of indirect covariance NMR methods. Our initial explorations in this area led to the development of unsymmetrical indirect covariance methods, which allow the calculation of hyphenated 2D NMR spectra such as 2D GHSQCCOSY and GHSQCNOESY from the discrete component 2D NMR experiments. We now wish to report the utilization of unsymmetrical indirect covariance NMR methods for the combination of 1H13C GHSQC and 1H15N longrange (GHMBC, IMPEACHMBC, CIGARHMBC, etc.) heteronuclear chemical shift correlation spectra to determine 15N13C correlation pathways.
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