Using O=C1CNC(=O)N1, CCOC(=O)CCCOc1ccc([N+](=O)[O-])c(C=O)c1 to produce O=C(O)CCCOc1ccc([N+](=O)[O-])c(C=C2NC(=O)NC2=O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.