[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a serine zwitterion obtained by transfer of a proton from the carboxy to the amino group of D-serine. It is an enantiomer of a L-serine zwitterion. It is a tautomer of a D-serine."}, {"from": "gpt", "value": "[C][Branch1][#Branch2][C@H1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][NH3+1][O]"}]