SMILES: C[C@H]([C@H](C(=O)[O-])[NH3+])O
Description: The molecule is a D-alpha-amino acid zwitterion that is D-allothreonine in which a proton has been transferred from the carboxy group to the amino group. It is the major species at pH 7.3. It is a tautomer of a D-allothreonine.