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The most important group of aromatic compounds are those through which one or more of the hydrogens of benzene are replaced by some other atom or group, as in toluene (C6H5CH3) and benzoic acid (C6H5CO2H). Polycyclic aromatic compounds are assemblies of benzene rings that share a common aspect—for example, naphthalene (C10H8). Heterocyclic aromat