The molecule is a dipeptide obtained by formal condensation of the carboxy group of L-histidine with the amino group of L-isoleucine. It derives from a L-histidine and a L-isoleucine.
(2S,3S)-2-[[(2S)-2-amino-3-(1H-imidazol-5-yl)propanoyl]amino]-3-methylpentanoic acid