Using COC(=O)CCc1ccc2nc(-c3cccnc3)nc(Nc3ccc(F)c(Cl)c3)c2c1 to produce O=C(O)CCc1ccc2nc(-c3cccnc3)nc(Nc3ccc(F)c(Cl)c3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.