Using Cc1c(CC2(C(=O)OC(C)(C)C)CC2)cccc1[N+](=O)[O-] to produce Cc1c(N)cccc1CC1(C(=O)OC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.