[{"from": "human", "value": "Describe this molecule. [C][=C][C][=Branch1][S][=C][C][=C][Ring1][=Branch1][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][NH3+1][O]"}, {"from": "gpt", "value": "The molecule is an alpha-amino-acid cation that is the conjugate acid of tyrosine, arising from protonation of the amino group. It is a conjugate acid of a tyrosine."}]