Using NC(=O)c1ccc(Br)c2c3c([nH]c12)CC(CNC(=O)CCCBr)CC3 to produce NC(=O)c1ccc(Br)c2c3c([nH]c12)CC(CN1CCCC1=O)CC3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.