Using O=C(OC(Cl)(Cl)Cl)OC(Cl)(Cl)Cl, N[C@H](c1cccc(Br)c1)[C@H](O)C(=O)O to produce O=C1N[C@H](c2cccc(Br)c2)[C@@H](C(=O)O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.