Using CCc1cc(N[C@H]2CC[C@@H](C(C)(C)C)CC2)ncn1, FF to produce CCc1ncnc(N[C@H]2CC[C@@H](C(C)(C)C)CC2)c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.