Using COC(=O)Oc1ccc(C(=O)O)cc1, O=c1ccc2ccc(O)cc2o1 to produce COC(=O)Oc1ccc(C(=O)Oc2ccc3ccc(=O)oc3c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.