Using O=C(O)c1cnc(C(=O)c2cn(Cc3ccc(Cl)cc3)c3ccccc23)[nH]1, C1COCCN1 to produce O=C(c1ncc(C(=O)N2CCOCC2)[nH]1)c1cn(Cc2ccc(Cl)cc2)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.