What is "oxadiazole"

n. (context organic compound English) Any five-membered heterocycle having two carbon atoms, two nitrogen atoms, one oxygen atom, and two double bonds

Oxadiazoles are a class of heterocyclic aromatic chemical compound of the azole family; with the molecular formula CHNO. There are four isomers of oxadiazole:

| 1,2,5-oxadiazole
(furazan)

1,2,4-Oxadiazole, 1,2,5-oxadiazole, and 1,3,4-oxadiazole are known, but the 1,2,3-isomer is unstable ring-opens to form the diazo ketone tautomer. The stable oxadiazoles appear in a variety of pharmaceutical drugs including raltegravir, butalamine, fasiplon, oxolamine, and pleconaril.