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