[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is the ammonium ion resulting from protonation of all three amino groups of bis(3-aminopropyl)amine; major species at pH 7.3. It is a conjugate acid of a bis(3-aminopropyl)amine."}, {"from": "gpt", "value": "[C][Branch1][Ring1][C][NH3+1][C][NH2+1][C][C][C][NH3+1]"}]