Using O=Cc1ccc(O)cc1, Cc1ccc(-c2ccc(C(=O)O)cc2)cc1 to produce Cc1ccc(-c2ccc(C(=O)Oc3ccc(C=O)cc3)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.