SMILES: C[NH+](C)C(CCC1=NC=C(N1)C[C@@H](C(=O)[O-])[NH3+])C(=O)[O-]
Description: The molecule is an amino acid zwitterion obtained by transfer of protons from the amino to the carboxy groups of 2-[3-carboxy-3-(dimethylamino)propyl]-L-histidine. It is a tautomer of a 2-[3-carboxy-3-(dimethylamino)propyl]-L-histidine.