A class of aromatic heterocyclic compounds consisting of a benzene ring fused to a five-membered ring containing nitrogen and either oxygen or sulfur.
From 'benz-' (benzene) + 'azole' (from 'aza-' meaning nitrogen + '-ole' suffix for five-membered rings). These compounds were systematically characterized in the late 1800s as chemists explored nitrogen-oxygen and nitrogen-sulfur heterocycles.
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