Using O=C1[C@@H]2C[C@@H](O)CN2C(=O)N1c1cc(Cl)cc(Cl)c1 to produce O=C1C[C@H]2C(=O)N(c3cc(Cl)cc(Cl)c3)C(=O)N2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.