[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a cyclic dicarboxylic anhydride that is the cyclic anhydride of maleic acid. It has a role as an allergen. It is a cyclic dicarboxylic anhydride and a member of furans."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][C][=O][O][C][Ring1][=Branch1][=O]"}]