Using CN(CC1CCN(c2c([N+](=O)[O-])cnn2C)CC1)C(=O)OC(C)(C)C to produce CN(CC1CCN(c2c(N)cnn2C)CC1)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.