1,2,3,6-Tetragalloylglucose (TeGG) has antioxidative activity, it also shows the most potent anticomplement activity (IC50 = 34 microM). 1,2,3,6-Tetragalloylglucose is also a potent inhibitor of UDPglucuronosyltransferase 1 A1 (UGT1A1, Ki = 1.68 μM).