Exhibits glutathione-dependent thiol transferase and dehydroascorbate (DHA) reductase activities. glutathione + RX = a halide anion + an S-substituted glutathione + H(+) 2 glutathione + L-dehydroascorbate = glutathione disulfide + L-ascorbate Monomer. Belongs to the GST superfamily. DHAR family.