[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an ammonium ion that is the trication of spermidine, formed by protonation at all three nitrogens. It has a role as a human metabolite and a fundamental metabolite. It is an ammonium ion derivative and an organic cation. It is a conjugate acid of a spermidine."}, {"from": "gpt", "value": "[C][Branch1][Branch2][C][C][NH2+1][C][C][C][NH3+1][C][NH3+1]"}]