Using CC(=O)O[C@H](C)CCCCn1c(=O)cc(N)n(C)c1=O, O=N[O-] to produce CC(=O)O[C@H](C)CCCCn1c(=O)c(N)c(N)n(C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.