Using C=C(C)C(=O)OC(CC)C(F)(F)C(=O)O, OCC(F)(F)F to produce C=C(C)C(=O)OC(CC)C(F)(F)C(=O)OCC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.