Using CCCn1nc(C(=O)c2cccc(OC)c2)c2cccc(C(F)(F)F)c21 to produce CCCn1nc(C(=O)c2cccc(O)c2)c2cccc(C(F)(F)F)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.