Using O=C([O-])[O-], CCOC(=O)c1nn(Cc2c(F)cc(OCC)cc2F)c(O)c1C to produce CCOC(=O)c1nn(Cc2c(F)cc(OCC)cc2F)c(OC)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.