High activity toward 1-chloro-2,4-dinitrobenzene. Not very efficient at catalyzing the addition of GSH to enones and epoxides. glutathione + RX = a halide anion + an S-substituted glutathione + H(+) Homodimer. More abundant in the digestive gland than in the testis, mantle, or lens. Belongs to the GST superfamily. Sigma family.