Using O=C([O-])[O-], COc1ccc(Cn2c(=O)cc(C(F)(F)F)[nH]c2=O)cc1 to produce COc1ccc(Cn2c(=O)cc(C(F)(F)F)n(C)c2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.