A chemical compound where a benzene ring is fused to a six-membered ring containing sulfur, similar in structure to other benzofused heterocycles.
From 'benzo-' (benzene) + 'thiopyran' (six-membered ring with sulfur and four carbons; 'pyran' from Greek pyron, grain, originally named for a resemblance to a chalice shape). Nomenclature developed in early 20th-century synthetic organic chemistry.
Benzothiopyrans are found in some plant pigments and defense compounds, and they're being studied because their sulfur atoms make them reactive in ways that pure carbon rings aren't—basically, adding one element (sulfur) opens up totally new chemical possibilities.
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