The molecule is a tripeptide zwitterion resulting from the transfer of a proton from the carboxy group to the amino group of Gly-Gly-Pro. Major microspecies at pH 7.3. It is a tautomer of a Gly-Gly-Pro.
(2S)-1-[2-[(2-azaniumylacetyl)amino]acetyl]pyrrolidine-2-carboxylate