Using CCOC(=O)c1c(C)nn2c(O)cc(C)cc12, OCc1c(F)ccc(F)c1F to produce CCOC(=O)c1c(C)nn2c(OCc3c(F)ccc(F)c3F)cc(C)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.