Using CCCCCI, O=C1NC(=O)C2(c3ccc([N+](=O)[O-])cc3)CC1C2 to produce CCCCCN1C(=O)C2CC(c3ccc([N+](=O)[O-])cc3)(C2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.