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Leea indica (Burm.f.) Merr. is a Vietnamese traditional medicinal plant used for the treatment of many different diseases. However, there has been no investigation of chemical constituents and biological activities of it. Isolated compounds from L. indica consist of two phenolics, gallic acid (1) and 3,4,3′-tri-O-methylellagic acid (2), two flavonoids, quercitrin (3) and myricitrin (4), three triterpenoids, ursolic acid (5), maslinic acid (6), and hederagenin (7), one alkaloid, tetrandrine (8) and three steroids, β-sitosterol (9), stigmasterol (10), and daucosterol (11). Among them, compounds 2, 6, 7, 8, and 10 were isolated from L. indica for the first time. Moreover, the ethyl acetate extract of leaves (LILE), ethyl acetate extract of stem barks (LISBE), methanol extract of leaves (LILM) from L. indica, and the mixture of β-sitosterol (9) and stigmasterol (10) significantly inhibited nitric oxide (NO) production, with IC50 values of 10.01 ± 0.35, 15.51 ± 0.61, 11.38 ± 1.01, and 59.36±10.23 µg/mL, respectively. The percentage of inhibition of edema reached 26.53% after treatment with daucosterol (11) at a dose of 100 mg/kg b.wt. The LILE was also found to exhibit the greatest cytotoxic effect against all four cell lines tested with IC50 values ranging from 7.22 to 10.65 µg/mL. These results confirmed that the extracts of L. indica leaf and stem bark, as well as compounds 9/10 and 11, exhibit very potential anti-inflammatory and cytotoxic effects.
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