Has a strong specific activity toward 1-chloro-2,4-dinitrobenzene and ethacrynic acid. glutathione + RX = a halide anion + an S-substituted glutathione + H(+) Optimum pH is 8.5 with 1-chloro-2,4-dinitrobenzene as substrate. Homodimer. In A.dichotoma there are at least two isozymes of glutathione S-transferase. Belongs to the GST superfamily. Sigma family.