Using O=C(O)CN1C(=O)CCc2ccc(NC(=O)c3ccc(C(F)(F)F)cc3NC3CCCCC3)cc21, CN to produce CNC(=O)CN1C(=O)CCc2ccc(NC(=O)c3ccc(C(F)(F)F)cc3NC3CCCCC3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.