Common mechanism of metabolic activation to form depurinating DNA adducts for benzene, naphthalene, estrone/estradiol, diethylstilbestrol, hexestrol and dopamine. 1,2-DHN, 1,2-dihydroxynaphthalene; 1,2-NQ, 1,2-naphthoquinone; HES, hexestrol; DA, dopamine.