Using O=C1CCC(=O)N1Br, Cc1ccc(F)c(Oc2cc(Cl)cc(C#N)c2)c1F to produce N#Cc1cc(Cl)cc(Oc2c(F)ccc(CBr)c2F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.