Using CCCC1CCC(C2CCC(c3ccc(-c4ccc(OCC)c(F)c4F)c(F)c3F)C(O)O2)CC1 to produce CCCC1CCC(C2CCC(c3ccc(-c4ccc(OCC)c(F)c4F)c(F)c3F)CO2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.