Using Fc1ncc(F)c(F)n1, C[C@@H](OC(C)(C)C)[C@H]1COC(=O)N1 to produce C[C@@H](OC(C)(C)C)[C@H]1COC(=O)N1c1nc(F)ncc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.