Using CCOC(=O)CCCOc1cc2c(cc1-c1ccc(C(F)(F)F)cc1)CCC2=O to produce O=C(O)CCCOc1cc2c(cc1-c1ccc(C(F)(F)F)cc1)CCC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.