[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a dipeptide zwitterion resulting from transfer of a proton from the carboxy to the amino group of L-threonyl-L-serine; major species at pH 7.3. It is a tautomer of a Thr-Ser."}, {"from": "gpt", "value": "[C][C@H1][Branch2][Ring1][Ring2][C@@H1][Branch1][S][C][=Branch1][C][=O][N][C@@H1][Branch1][Ring1][C][O][C][=Branch1][C][=O][O-1][NH3+1][O]"}]