Using O=C1N(c2cc(Cl)cc(Cl)c2)C(=O)[C@]2(Cc3ccc(Br)cc3)C[C@@H](O)CN12 to produce O=C1CN2C(=O)N(c3cc(Cl)cc(Cl)c3)C(=O)[C@]2(Cc2ccc(Br)cc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.