Using FC(F)(F)c1ccc(-c2nnc(-c3cccc(C4OCCO4)c3)o2)cc1 to produce O=Cc1cccc(-c2nnc(-c3ccc(C(F)(F)F)cc3)o2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.