Using COC(=O)CC(=O)C(C)(C)C, N=C(N)c1ccccc1C(F)(F)F to produce CC(C)(C)c1cc(=O)[nH]c(-c2ccccc2C(F)(F)F)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.