Using CCCC=CC(NC(C)=O)(C(=O)OCC)C(=O)OCC, C[N+]1([O-])CCOCC1 to produce CCOC(=O)C(CCCCC=O)(NC(C)=O)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.