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benzofluorene polycyclic aromatic hydrocarbon pah coal tar cigarette smoke smog dna adducts metabolism biotransformation safety substance matter material compound component agent precursor synthesis reaction production building block poison venom toxicant toxic toxicity toxin toxicology poisoning danger hazard mutagen mutagenic mutagenesis genotoxic carcinogen cancer carcinogenicity carcinogenic carcinogenesis tumor molecule molecular formula structural structure 3d