Using O=C(Br)C(Br)CCCl, CN(C(=O)c1ccc(C2CCCCC2)cc1)c1ccc(N)cc1 to produce CN(C(=O)c1ccc(C2CCCCC2)cc1)c1ccc(N2CCC(Br)C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.