[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule appears as odorless white crystals or crystalline powder. Tasteless, but numbs the tongue. Aqueous solutions slightly acidic to litmus. "}, {"from": "gpt", "value": "[C][C][C][C][O][C][=Branch1][C][=O][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O]"}]