Using O=c1[nH]c(=O)n(-c2cccc([N+](=O)[O-])c2)c2ncccc12, CCOS(=O)OCC to produce CCn1c(=O)c2cccnc2n(-c2cccc([N+](=O)[O-])c2)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.