-N3

from The Collaborative International Dictionary of English v.0.48

azide \az"ide\ n. (Chem.)
   any chemical compound containing the azido group {-N3}, such
   as {sodium azide} (ionic and inorganic) or {ethyl azide}
   (organic and nonionic).
   [PJC]

from The Collaborative International Dictionary of English v.0.48

azido \azido\ adj.
   relating to or containing the azido group {-N3}.
   [WordNet 1.5]