. "CHEBI:33658"^^ . . "C553"^^ . "Aromatic Hydrocarbon"^^ . . "Chemical Viewed Structurally"^^ . "Aromatic Hydrocarbon"^^ . "Organic Chemical"^^ . . "Aromatic_Hydrocarbon"^^ . . "Organic compounds containing carbon and hydrogen in the form of an unsaturated, usually hexagonal ring structure. The compounds can be single ring, or double, triple, or multiple fused rings.MSH2002_06_01" . "C0020245"^^ . "Aromatic HydrocarbonPTNCI" .