[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a quadruply-charged organic cation arising from protonation of the four amino groups of 2'-oxokanamycin A; major species at pH 7.3. It is an organic cation and an ammonium ion derivative. It is a conjugate acid of a 2'-oxokanamycin."}, {"from": "gpt", "value": "[C][C@H1][Branch2][Branch1][=N][C@@H1][Branch2][Ring2][Ring1][C@H1][Branch2][Ring1][=C][C@@H1][Branch1][Branch1][C@H1][Ring1][=Branch1][NH3+1][O][C@@H1][C][=Branch1][C][=O][C@H1][Branch1][=N][C@@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][#Branch1][C][NH3+1][O][O][O][O][C@@H1][C@@H1][Branch1][P][C@H1][Branch1][=N][C@@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][O][NH3+1][O][NH3+1]"}]