Using O=C1c2[nH]c3ccc(Cl)c(Cl)c3c2CCC1(Br)Cc1ccccc1 to produce Oc1c(Cc2ccccc2)ccc2c1[nH]c1ccc(Cl)c(Cl)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.