[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][C][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][Br][C][=Branch1][Branch1][=C][N][Ring1][Branch2][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is an alpha-amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of 5-bromotryptophan; major species at pH 7.3. It is a tautomer of a 5-bromotryptophan."}]