[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an ammonium ion that is the conjugate acid of serotonin; major species at pH 7.3. It has a role as a human metabolite. It is a conjugate acid of a serotonin."}, {"from": "gpt", "value": "[C][=C][C][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][O][C][=Branch1][Branch1][=C][N][Ring1][Branch2][C][C][NH3+1]"}]