The current substantial interest concerning the structure elucidation of new active natural products led to the complete 1H and 13C chemical shift assignment of a triterpenoid derivative, methyl 2α,3β,24-tri-O-acetylolean-12α-chloro-28,13β-olide, obtained after acetylation and methylation of a mixture isolated from Mentha villosa. The 2D shift-correlated NMR techniques HMBC, HMQC, COSY and NOESY were used.
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Monte et al. (1998) studied this question.
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