Using CC(C)(C)OC(=O)N(CC=CCl)c1ccc2cc(C#N)ccc2c1Br to produce CC(C)(C)OC(=O)N1CC(CCl)c2c1ccc1cc(C#N)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.