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Three new biflavonoids, umcephabiovins C − E ( 1 − 3 ), along with fourteen known compounds were isolated from the twigs and leaves of  Cephalotaxus oliveri . Their structures and configurations were elucidated by UV, IR, NMR, ECD, and HR-ESI-MS spectra. Compounds  1 − 3  exhibited significant  α -glucosidase inhibitory activity with IC 50  values of 7.05 ± 2.66, 24.45 ± 4.73, and 1.84 ± 1.14  μ M, respectively. Compound  11  showed moderate cytotoxicity against the BaF3/T315I cell line.

Biflavonoids from the twigs and leaves of Cephalotaxus oliveri Mast. and their α -glucosidase inhibitory activity