May be involved in the conjugation of reduced glutathione to a wide number of exogenous and endogenous hydrophobic electrophiles and have a detoxification role against certain herbicides. glutathione + RX = a halide anion + an S-substituted glutathione + H(+) By acetochlor, metolachlor and 2,4,6-trinitrotoluene (TNT). Belongs to the GST superfamily. Tau family.