Using CC1=CC2C(C1)CC2(CC(=O)OC(C)(C)C)C[N+](=O)[O-] to produce CC1=CC2C(C1)CC2(CN)CC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.