In mammals anthracene (1) is predominantly metabolized by cytochrome P450 to the 1,2-epoxide (2). The epoxide is hydrolyzed by epoxide hydrolase to give 1,2-dihydroanthracene-1,2-diol (3). In microorganisms this is only the first step for a total degradation of the ring system with many intermediates that ultimately lead to salicylic acid (10).
Mammals excrete the 1,2-dihydroanthracene-1,2-diol (3) conjugated with sulfate or glucuronic acid in urine. In rats also 9,10-dihydroanthracene-9,10-diol (11) and anthracene-2,9,10-triol (12) have been shown to appear in urine as metabolites of anthracene (1).