Detailed analysis of the 1H and 13C NMR spectra of three natural quinone‐methide triterpenoids, pristimerin, tingenone and 20‐hydroxytingenone, was carried out by the application of two‐dimensional 1H1H and 1H13C shift correlation techniques. Some previous 1H and 13C assignments have been revised.
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Gunatilaka et al. (1989) studied this question.
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