Using O=C(O)C(F)(F)F, FC1(F)c2ccccc2Cc2ccccc2C1(F)F to produce O=C1c2ccccc2C(F)(F)C(F)(F)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.