Using CCOC(=O)c1ccc(Nc2cc(NC(=O)c3c(Cl)cccc3Cl)ccn2)cc1 to produce O=C(O)c1ccc(Nc2cc(NC(=O)c3c(Cl)cccc3Cl)ccn2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.