A 2R,3R stereoisomer of catechin; a powerful antioxidant; inhibits COX-1 (IC50 = 3.2 μM); at 100 µM, induces apoptosis in human adenocarcinoma PC-9 cells and stimulates the inhibition of TNF-α release from BALB-c/3T3 cells treated with epigallocatechin gallate.