Using O=C1CCC(=O)N1Br, Cc1ccc(Oc2ccc(C#N)c(Cl)c2)cc1Cl to produce N#Cc1ccc(Oc2ccc(CBr)c(Cl)c2)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.