[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is an amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of tryptophan; major species at pH 7.3. It is a tautomer of a tryptophan."}, {"from": "gpt", "value": "[C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=Branch1][Branch1][=C][N][Ring1][=Branch1][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}]