What is "pentazole"

n. 1 (context inorganic compound English) The five-membered homocyclic compound containing five nitrogen atoms and two double bonds 2 (context organic chemistry English) Any organic derivative of this compound; they are explosive

Pentazole is an aromatic chemical molecule consisting of a five-membered ring with all nitrogen atoms, one of which is bonded to a hydrogen atom. It has a molecular formula HN. Its SMILES structure is . Although strictly speaking a homocyclic, inorganic compound, pentazole has historically been classed as the last in a series of heterocyclic azole compounds containing one to five nitrogen atoms. This set contains pyrrole, imidazole, pyrazole, triazoles, tetrazoles, and pentazole.