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diazole

n. (context organic compound English) Either of two unsaturated heterocycles consisting of a five-membered ring containg three carbon atoms, two nitrogen atoms and two double bonds - namely pyrazole and imidazole

Wikipedia
Diazole

Diazole refers to either one of a pair of isomeric chemical compounds with molecular formula CHN, having a five-membered ring consisting of three carbon atoms and two nitrogen atoms.

The two isomers are:

  • Imidazole (1,3-diazole) image:Imidazole chemical structure.png
  • Pyrazole (1,2-diazole) 80px|