SMILES: C1=C(NC(=N1)CCC(C(=O)[O-])[NH3+])C[C@@H](C(=O)[O-])[NH3+]
Description: The molecule is a dizwitterionic form of 2-(3-amino-3-carboxypropyl)-L-histidine arising from transfer of two protons from the carboxy to the amino groups; major species at pH 7.3. It is a tautomer of a 2-(3-amino-3-carboxypropyl)-L-histidine.