A new tirucallane-type triterpenoid, swietentol (1), was isolated from the barks of Swietenia macrophylla, together with four known triterpenoids (2-5), five known limonoids (6-10), and other six compounds (11-16). The structure of swietentol (1) was elucidated by extenstive 2D NMR and MS analysis.
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