Using O=C(N[C@@H]1CCNC1)c1ccc(Cl)s1, O=C(Br)CBr to produce O=C(N[C@@H]1CCN(C(=O)CBr)C1)c1ccc(Cl)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.