A fused-ring aromatic compound consisting of a benzene ring bonded to a diazine ring (six-membered ring with two nitrogen atoms), such as quinoxaline or phenazine.
From 'benz-' (benzene) + 'diazine' (from 'di-' meaning two + 'aza-' meaning nitrogen + '-ine' suffix). These compounds were discovered and named systematically in the late 1800s.
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