A bicyclic aromatic compound with benzene fused to a five-membered ring containing sulfur and nitrogen, used in rubbers, dyes, and medicines.
'Benzo-' plus 'thiazole' (from 'thio-' sulfur and '-azole' five-membered). Discovered in the 19th century and became industrially important for vulcanization.
Benzothiazole derivatives are literally in your car tires—the rubber industry uses them as vulcanization accelerators, which means they're one of the most mass-produced heterocyclic compounds in the world, though few people realize it.
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