[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a hydrochloride. It has a role as a central nervous system stimulant. It contains a methylphenidate(1+)."}, {"from": "gpt", "value": "[C][O][C][=Branch1][C][=O][C][Branch1][=Branch2][C][C][C][C][C][NH2+1][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1].[Cl-1]"}]