Using COC(=O)CN, O=C(O)c1ccc(C(F)(F)Cl)[nH]c1=O to produce COC(=O)CNC(=O)c1ccc(C(F)(F)Cl)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.