A chemical compound where a benzene ring is fused to a furan ring (a five-membered ring with oxygen) that also contains sulfur.
From 'benzo-' (benzene) + 'thio-' (sulfur) + 'furan' (an oxygen-containing five-membered heterocycle named in 1870 from 'furfural'). This compound name reflects 20th-century systematic nomenclature for synthesized aromatic compounds.
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