Using O=C1C(Cl)=C(Cl)C(=O)C(Cl)=C1Cl, OC1CCCCC1 to produce O=C1C(Cl)=C(Cl)C(=O)C(OC2CCCCC2)=C1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.