Using O=C1Nc2nc(Cl)ccc2C2(Cc3ccc([N+](=O)[O-])cc3C2)O1 to produce Nc1ccc2c(c1)CC1(C2)OC(=O)Nc2ncccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.