Using Nc1ccc(Br)cc1Cl, CCC(CC)c1ccc(Cl)c2nc(Cl)n(CC(=O)OC(C)C)c12 to produce NC1=CCC(Cl)(Br)C=C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.