Using C=CC(F)(F)C(O)c1sc(-c2ccc(C(F)(F)F)nc2)nc1C to produce CCC(F)(F)C(O)c1sc(-c2ccc(C(F)(F)F)nc2)nc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.