The molecule is an ammonium ion resulting from the protonation of the secondary amino group of benazepril. It is a conjugate acid of a benazepril.
[(3S)-1-(carboxymethyl)-2-oxo-4,5-dihydro-3H-1-benzazepin-3-yl]-[(2S)-1-ethoxy-1-oxo-4-phenylbutan-2-yl]azanium