Using COS(=O)(=O)OC, COC(=O)c1c(C)c(C(=O)c2ccc([N+](=O)[O-])c(OC)c2)n2cccc(O)c12 to produce COC(=O)c1c(C)c(C(=O)c2ccc([N+](=O)[O-])c(OC)c2)n2cccc(OC)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.