Using C=CCOc1ccc(OCC(=O)OCC)c(C(=O)NCc2ccc(Br)cc2F)c1 to produce CCCOc1ccc(OCC(=O)OCC)c(C(=O)NCc2ccccc2F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.