Abstract
Abstract The molecular sites of methyl, methoxy and other simple substituents can have a marked influence on the biological activity of polycyclic aromatic hydrocarbons (PAH). Thus the carcinogenic activities of the monomethyl-(MBA), dimethyl-(DMBA) and polymethylbenz[a]anthracenes range from the negligible in 2-MBA or slight in-1,12-DMBA to the extremely potent in 7-MBA or 7,12-DMBA, even though the structure differences are relatively small. Much the same applies to substitution in phenanthrenes (Johnson et al., 1989), benzfluoranthenes and other PAH.
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