Nitropentadecene, or more precisely (E)-1-nitropentadec-1-ene, is a highly toxic unsaturated nitroalkene, the only aliphatic nitro compound

Nitro compound

Nitro compounds are organic compounds that contain one or more nitro functional groups . They are often highly explosive, especially when the compound contains more than one nitro group and is impure. The nitro group is one of the most common explosophores used globally...

 known to be synthesized by insects. It is produced by termite

Termite

Termites are a group of eusocial insects that, until recently, were classified at the taxonomic rank of order Isoptera , but are now accepted as the epifamily Termitoidae, of the cockroach order Blattodea...

soldiers of Prorhinotermes genus (Isoptera, Rhinotermitidae) as a defensive chemical. Nitropentadecene is biosynthesized and stored in one of the exocrine glands, a frontal gland, of termite soldiers, and it is released upon attack of enemy.