[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a member of xanthones."}, {"from": "gpt", "value": "[C][O][C][=C][Branch2][Ring1][Ring2][C][=C][C][=C][Ring1][=Branch1][O][C][=C][C][=C][C][=C][Ring1][=Branch1][C][Ring1][#Branch2][=O][O]"}]