[{"from": "human", "value": "What can you tell me about 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-1][NH3+1][O][O]"}, {"from": "gpt", "value": "The molecule is an amino acid zwitterion obtained from the transfer of a proton from the carboxy group to the amino group of D-dopa. Major microspecies at pH 7.3. It is an enantiomer of a L-dopa zwitterion. It is a tautomer of a D-dopa."}]