Using CC(C)(C)OC(=O)C1=C(O)C(=O)N(c2ccccc2F)C1, NO to produce CC(C)(C)OC(=O)C1CN(c2ccccc2F)C(=O)C1=NO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.