Using O=[O+][O-], C=Cc1nn(C)c(=O)c(-n2c(Cl)c(Cl)c3ccccc32)c1OC to produce COc1c(C=O)nn(C)c(=O)c1-n1c(Cl)c(Cl)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.