[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an amino acid zwitterion arising from transfer of a proton from the carboxy to the amino group of 4-(3-methylbut-2-enyl)-L-tryptophan; major species at pH 7.3. It is a tautomer of a 4-(3-methylbut-2-enyl)-L-tryptophan."}, {"from": "gpt", "value": "[C][C][=Branch2][Ring1][N][=C][C][C][=C][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][N][C][=C][Ring1][Branch2][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][C]"}]