Using COC(=O)c1cc2c([nH]1)CCC2Cc1cccc(-c2ccc(C(F)(F)F)cc2)c1 to produce O=C(O)c1cc2c([nH]1)CCC2Cc1cccc(-c2ccc(C(F)(F)F)cc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.