New arahypins isolated from fungal-challenged peanut seeds and their glucose uptake-stimulatory activity in 3T3-L1 adipocytes

► Three new stilbenoids (arahypins) were isolated from fungal-stressed peanut seeds. ► Their structures were elucidated and formation mechanisms proposed. ► The three compounds showed insulin sensitizing activity in 3T3-L1 adipocytes.