Using O=C(O)CCCCCC(c1ccc(F)cc1)c1cc(Br)c2ccccc2c1O to produce O=C(O)CCCCCC(c1ccc(F)cc1)c1ccc2ccccc2c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.