[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is an amino acid zwitterion arising from transfer of two protons from the carboxy to the amino groups of L-selenocystathionine; major species at pH 7.3. It is a tautomer of a L-selenocystathionine."}, {"from": "gpt", "value": "[C][Branch1][=N][C][Se][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}]