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triphenylene benzophenanthrene dibenzonaphthalene isochrysene polycyclic aromatic hydrocarbon pah aromatic aromaticity polycyclic ring coal tar trimerization resonance isomer chrysene benzanthracene tetracene hydrogenation mesogen substance matter material compound component agent stuff reagent functional group precursor synthesis reaction production building block molecule molecular formula skeletal structural structure geometry chemistry science scientific research organic chemical 3d white background