Using COc1cccc(CO)c1, O=Cc1cc(Br)c(O)c([N+](=O)[O-])c1 to produce COc1cccc(COc2c(Br)cc(C=O)cc2[N+](=O)[O-])c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.