[{"from": "human", "value": "Describe this molecule. [C][Branch1][Ring1][C][Se][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is an L-alpha-amino acid zwitterion obtained from L-selenohomocysteine by transfer of a proton from the carboxy group to the amino group. It is the major species at pH 7.3. It is a tautomer of a L-selenohomocysteine."}]