A five-membered aromatic ring containing two nitrogen atoms, the parent structure for important chemical families like imidazole and pyrazole.
From 'dia-' (two) + '-azole' (containing nitrogen). The naming convention for nitrogen-containing heterocycles emerged in 19th-century chemistry.
Diazoles are fundamental building blocks in biochemistry—they appear in histamine, the chemical that triggers allergies, and in purines and pyrimidines that make up your DNA.
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