Using CCCc1c(C(=O)OCC)sc(NC(=O)C(=O)OCC)c1[N+](=O)[O-] to produce CCCc1c(C(=O)OCC)sc2[nH]c(=O)c(=O)[nH]c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.