[{"from": "human", "value": "Provide a brief overview of this molecule. [C][=C][C][=Branch1][S][=C][C][=C][Ring1][=Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][O]"}, {"from": "gpt", "value": "The molecule is a non-essential amino acid. In animals it is synthesized from [phenylalanine]. It is also the precursor of [epinephrine], thyroid hormones, and melanin."}]