Using CC(Br)Br, CCOC(=O)c1c(S)nc2c(Cl)c(F)c(F)cc2c1O to produce CCOC(=O)c1c2n(c3c(Cl)c(F)c(F)cc3c1=O)C(C)S2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.