SMILES: C1=C(NC=N1)C[C@@H](C(=O)[O-])[NH3+]
Description: The molecule is zwitterionic form of L-histidine having an anionic carboxy group and a protonated alpha-amino group. It is an amino acid zwitterion and a polar amino acid zwitterion. It is a tautomer of a L-histidine.