[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the zwitterion formed from 5-aminolevulinic acid by transfer of a proton from the carboxy group to the amino group. It is the major species present at physiological pH. It is a tautomer of a 5-aminolevulinic acid."}, {"from": "gpt", "value": "[C][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][C][NH3+1]"}]