[{"from": "human", "value": "Describe this molecule. [C][C][O][C][=Branch1][C][=O][C][C][C][C][Branch1][#Branch2][C][=Branch1][C][=C][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a tensyuic acid that is itaconic acid which has been substituted at position 3 by a 3-(ethoxycarbonyl)propyl group. The (-)-isomer, isolated from Aspergillus niger FKI-2342. It has a role as an Aspergillus metabolite. It is a tensyuic acid, an ethyl ester and a dicarboxylic acid."}]