SMILES: C1=CC(=CC=C1C[C@@H](C(=O)[O-])[NH3+])N
Description: The molecule is an amino acid zwitterion arising from transfer of a proton from the carboxy to the amino group of 4-amino-L-phenylalanine; major species at pH 7.3. It is a tautomer of a 4-amino-L-phenylalanine.