Using CCOC(=O)CCc1c(C(=O)OCC)[nH]c2c(Br)ccc(F)c12 to produce CCOC(=O)c1[nH]c2c(Br)ccc(F)c2c1CCC(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.