Using CCOC(=O)Cc1nc(-c2ccc(Cl)c(Cl)c2)oc1-c1ccoc1 to produce O=C(O)Cc1nc(-c2ccc(Cl)c(Cl)c2)oc1-c1ccoc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.