Using O=C(Cl)CBr, CC(=O)C(=NNc1ccc(Cl)cc1)C(C)=O to produce CC(=O)c1nn(-c2ccc(Cl)cc2)c(=O)c(Br)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.