Abstract
An investigation on the extract from the plant Trichilia sinensis Bentv. led to the isolation of 13 new limonoids (1−13), in which two were of khayalactone skeleton and 11 were phragmalin-type limonoids, and eight known phragmalin-type limonoids (14–21). Their structures were elucidated by using spectroscopic techniques and HRESIMS experiment. Compounds 6 and 17 displayed potent protein tyrosine phosphatase 1B inhibitory activity with IC50 values of 1.2 ± 0.1 and 8.1 ± 0.5 μM, respectively.
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