Using COC(=O)c1c2c(n(Cc3ccc(F)cc3)c1C(=O)OC)CCOC2 to produce O=C(O)c1c2c(n(Cc3ccc(F)cc3)c1C(=O)O)CCOC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.