Two new enol-derived butenolactones, rotundifolides A (1) and B (2), along with four known related compounds, lincomolide C (3), lincomolide A (4), marliolide (5), and litsenolide A1 (6), were isolated from the bark of Litsea rotundifolia var. oblongifolia. The structures of the new metabolites were characterized by spectroscopic methods and comparison with known compounds.
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Zhao et al. (2005) studied this question.
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