[{"from": "human", "value": "Describe this molecule. [C][O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][N][C][=C][Ring1][#Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1]"}, {"from": "gpt", "value": "The molecule is a zwitterion obtained by transfer of a proton from the carboxy to the amino terminus of 5-methoxy-L-tryptophan; major species at pH 7.3. It is a tautomer of a 5-methoxytryptophan."}]