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New geranyl flavonoids from the leaves of Artocarpus communis.
Journal of Natural Medicines 2018 June
Four new geranyl flavonoids 1-4 and four known flavonoids 5-8 were obtained from the leaves of Artocarpus communis collected in Indonesia. The planar structures of flavonoids were elucidated by analyses of MS and NMR spectroscopic data. Absolute configurations of 1 and 2 were determined by ECD spectroscopy. Analyses by HPLC with a chiral-phase column and ECD spectra confirmed that 3 and 4 were stereoisomeric mixtures and 7 and 8 were racemic mixtures. The compounds obtained in this study inhibited the enzymatic activities of ubiquitin-specific protease 7 (USP7) and the chymotrypsin-like activity of the proteasome. Among the geranyl flavonoids tested in this experiment, the USP7 inhibitory activity of 6 (IC50 value, 0.094 μM) was 55 times more potent than the commercially available positive control, P5091 (IC50 value, 5.2 μM).
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