[{"from": "human", "value": "Provide a brief overview of this molecule. [C][O][C][=C][Branch2][Ring1][C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][Branch1][=Branch1][C][=Branch1][C][=O][O][O][O]"}, {"from": "gpt", "value": "The molecule is an aromatic ether that is a product of catecholamine metabolism. Vanillylmandelic acid may be a used as marker for tumors that secrete catecholamines, such as neuroblastoma or pheochromocytoma."}]