A fused heterocyclic compound containing a benzene ring joined to a triazole ring (a five-membered ring with three nitrogen atoms), used as a corrosion inhibitor and UV stabilizer.
From 'benz-' (benzene) + 'bitriazole' (from 'bi-' meaning two + 'triazole'). This term developed in materials chemistry in the 20th century as engineers needed compounds to protect metals and plastics.
Benzotriazole (the common form) is a quiet superhero of modern materials—it protects copper coins, brass fixtures, and UV-sensitive plastics from degradation, which is why it's in everything from currency to outdoor furniture.
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