Using OCCBr, O=S1(=O)N(CCCBr)c2ccccc2N1c1ccc(Cl)cc1F to produce O=S1(=O)N(CCBr)c2ccccc2N1c1ccc(Cl)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.