Using CCOC(=O)/C=C/CCCn1c(Br)c(Cc2ccc(Cl)cc2)c2ccccc21 to produce CCOC(=O)/C=C1/CCCn2c1c(Cc1ccc(Cl)cc1)c1ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.