SMILES: C1=CC=C(C=C1)C[C@@H](C(=O)N[C@@H](CC2=CN=CN2)C(=O)[O-])[NH3+]
Description: The molecule is a dipeptide zwitterion obtained by transfer of a proton from the carboxy to the amino terminus of Phe-His. Major species at pH 7.3. It is a tautomer of a member of Phe-His.