The molecule is a dipeptide zwitterion that is the zwitterionic form of D-alanyl-D-alanine arising from migration of a proton from the OH of the carboxy terminus to the amino terminus. It has a role as an Escherichia coli metabolite. It is a tautomer of a D-alanyl-D-alanine.
(2R)-2-[[(2R)-2-azaniumylpropanoyl]amino]propanoate