Using CC(C)(C)OC(=O)N1CCC(C(=O)C(F)(F)F)C(=O)C1, N=CN to produce CC(C)(C)OC(=O)N1CCc2c(ncnc2C(F)(F)F)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.