[{"from": "human", "value": "Could you provide a description of this molecule? [C][=C][Branch2][Ring1][S][C][=C][Branch2][Ring1][#Branch2][C][=Branch1][Branch1][=C][Ring1][=Branch1][I][O][C][=C][C][=Branch1][N][=C][Branch1][Branch2][C][=Branch1][Ring2][=C][Ring1][=Branch1][I][O][I][I][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is the amino acid zwitterion formed from thyroxine by transfer of a proton from the carboxy group to the amino group. Major species at pH 7.3. It is a tautomer of a thyroxine."}]