Conjugation of reduced glutathione to a wide number of exogenous and endogenous hydrophobic electrophiles (PubMed:22082028, PubMed:20417639). Has DDT dehydrochlorinase activity (PubMed:20417639). May be involved in detoxification (PubMed:22082028). glutathione + RX = a halide anion + an S-substituted glutathione + H(+) 1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane = 1,1-dichloro-2,2-bis(4-chlorophenyl)ethylene + chloride + H(+) Homodimer. Has a specific activity toward 1-chloro-2,4-dinitrobenzene comparable to that for the mammalian glutathione S-transferases but did not have as broad a substrate specificity pattern. Has no GSH peroxidase activity. Belongs to the GST superfamily. Delta family. Extended N-terminus.