The molecule is a tripeptide zwitterion resulting from the transfer of a proton from the carboxy group to the amino group of Gly-Gly-Ile. Major microspecies at pH 7.3. It is a tautomer of a Gly-Gly-Ile.
(2S,3S)-2-[[2-[(2-azaniumylacetyl)amino]acetyl]amino]-3-methylpentanoate