Using COC(=O)c1ccc(Nc2ncc3c(=O)n(-c4c(Cl)cccc4Cl)c4nccn4c3n2)cc1 to produce O=C(O)c1ccc(Nc2ncc3c(=O)n(-c4c(Cl)cccc4Cl)c4nccn4c3n2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.