Resveratrol oligomer C-glucosides and anti-viral resveratrol tetramers isolated from the stem bark of Shorea uliginosa

•The absolute configurations of resveratrol oligomers were determined.•All the glucosides of oligomers bear 4-C-glucosylresveratrol building block(s).•Two resveratrol tetramers showed strong antiviral activity with a wide antiviral spectrum.