An aromatic chemical compound formed by fusing a benzene ring to a thiophene ring (a five-membered ring containing sulfur).
From 'benzo-' (benzene ring) + 'thiophene' (five-membered ring with sulfur; 'thio-' from Greek theion meaning sulfur, plus '-phene'). Named in the early 1900s as organic chemists created systematic names for newly synthesized aromatic compounds.
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