[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][C][C][C][C][C][C][C][C][=C][O][C][Branch1][Branch1][C][Ring1][Branch1][=O][C][C][Branch2][Ring1][Ring2][C][Branch1][Ring2][O][Ring1][#Branch1][Branch1][#Branch1][C][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is an oxaspiro compound that is 1,6-dioxaspiro[4.4]non-2-en-4-one substituted by a carboxymethyl group at position 2, carboxy groups at positions 2 and 3, an oxo group at position 9 and a nonyl group at position 8. Isolated from the culture broth of the fungus Talaromyces trachyspermus, it exhibits inhibitory activity against the enzyme heparanase. It has a role as a fungal metabolite and an EC 3.2.1.166 (heparanase) inhibitor. It is an oxaspiro compound and a tricarboxylic acid."}]