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The 13C NMR assignment of the triterpene 3α‐hydroxylup‐20(29)‐en‐23,28‐dioic acid and some of its derivatives has been carried out. In addition to conventional methods, 2D 1H13C chemical shift correlation, nuclear Overhauser enhancement difference and decoupling difference techniques were used for the assignment.
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Preiß et al. (1986) studied this question.
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