[{"from": "human", "value": "Describe this molecule. [C][=C][C][=Branch2][Ring1][Ring1][=C][Branch1][#C][C][=C][Ring1][=Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][I][O]"}, {"from": "gpt", "value": "The molecule is an intermediate in the production of thyroid hormones and derivative of tyrosine where the carbon at position 3 in the benzyl group has been iodinated by thyroid peroxidase. 3-iodotyrosine (mono-iodotyrosine) can be further iodinated by thyroid peroxidase to form di- and tri-iodo forms. Mono-iodotyrosine can combine with a di-iodotyrosine to form triiodothyronine (T3) and two di-iodotyrosines can combine to form thyroxine (T4)."}]