Using C=CC(N)=O, CCOC(=O)CC(=O)C(F)(F)C(F)(F)F to produce CCOC(=O)C1=C(C(F)(F)C(F)(F)F)NC(=O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.