[{"from": "human", "value": "Could you provide a description of this molecule? [C][N][C][=N][C][=C][Ring1][Branch1][C][=Branch1][C][=O][N][Branch1][=Branch2][C][=Branch1][C][=O][N][Ring1][Branch2][C][C]"}, {"from": "gpt", "value": "The molecule is a Central Nervous System Stimulant and Methylxanthine. The physiologic effect of caffeine is by means of Central Nervous System Stimulation."}]