Three new stilbene oligomers (1-3) were isolated from the stem bark of Vatica pauciflora. The structures of a resveratrol heptamer (pauciflorol D) (1), a resveratrol dimer (pauciflorol E) (2), and an indanone derivative (pauciflorol F) (3) were elucidated by means of spectroscopic data interpretation, especially HMBC and NOESY NMR experiments.
The antioxidant activity of 28 natural and synthetic hydroxyflavonoids was estimated through the 1,1-diphenyl-2-picrylhyrazyl (DPPH) radical, superoxide scavenging activities and lipid peroxidation inhibition. The result showed the hydroxylation pattern had close relationship with the appearance of activities.
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