Vitisinols from Vitis thunbergii

Vitisinols A and D (575, 576) were isolated from the roots of Vitis thunbergii vitisinol A (575) is a symmetrical dimer [245]. Longusol C (579) possessing a 1,4-dioxoran moiety from Cyperus longus [246] is a cis isomer of cassigarol E (540) from Cassia garrettiam [247]. 

Some stilbenoids from the roots of Vitis thunbergii, such as vitisinols B, C, D (772, 773, 576), (+)-e-viniferin (445), (-)-viniferal (771), ampelopsin C and (+)-vitisin C (700), displayed strong free radicalscavenging activities (ICsos 2.8 to 6.6 //M) [245]. The antioxidant capacity of tra s-e-viniferin (445) has also been evaluated and compared with those of resveratrol (1) and s)mthetic stilhene derivatives [504]. 

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