[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a sulfur-containing amino-acid anion that is the conjugate acid of methionine, arising from protonation of the amino group. It is a conjugate acid of a methionine."}, {"from": "gpt", "value": "[C][S][C][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][NH3+1]"}]