[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][O][C][=Branch1][C][=O][C][Branch1][=Branch2][C][C][C][C][C][N][Ring1][=Branch1][C][=C][C][=C][C][=C][Ring1][=Branch1]"}, {"from": "gpt", "value": "The molecule is a synthetic central nervous system stimulant. Methylphenidate appears to activate the brain stem arousal system and cortex to produce its stimulant effect and, in some clinical settings, may improve cognitive function."}]