Using O=C(O)C(Cl)Cl, CC(C)(C)C1(O)C=CC(Cl)=CC1C(O)c1ccccc1 to produce CC(C)(C)C1(c2ccccc2)OC(C(=O)O)Oc2ccc(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.