[{"from": "human", "value": "Generate a molecule based on this description. The molecule is zwitterionic form of 4-guanidinobutanoic acid. It is a tautomer of a 4-guanidinobutanoic acid."}, {"from": "gpt", "value": "[C][Branch1][#Branch1][C][C][=Branch1][C][=O][O-1][C][NH1+1][=C][Branch1][C][N][N]"}]