Using CCOC(=O)Cc1ccnc2c(NC(=O)c3c(Cl)cccc3Cl)cccc12 to produce O=C(O)Cc1ccnc2c(NC(=O)c3c(Cl)cccc3Cl)cccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.