Using NCCc1c[nH]c2ccc(Cl)cc12, O=C(O)C1CCN(C2CC2)C1=O to produce O=C(NCCc1c[nH]c2ccc(Cl)cc12)C1CCN(C2CC2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.