Using O=C1C(Cl)=C(Cl)C(=O)C(Cl)=C1Cl, CCOC(=O)C[Zn]Br to produce CCOC(=O)CC1(O)C(Cl)=C(Cl)C(=O)C(Cl)=C1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.