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