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acenaphthylene cyclopentadenaphthalene tricyclododecahexaene polycyclic aromatic hydrocarbon peri-fused tricyclic naphthalene acenaphthene hydrogenation polymerisation catalyst antioxidant toxicity sulfur dye poison venom toxicant toxic toxin toxicology poisoning danger hazard acute harmful exposure limit antidote intoxication detoxification substance matter material compound component agent stuff reagent functional group precursor synthesis reaction production building block chemistry 3d