Using CC(C)(C)CNc1c(Br)ccc(C(=O)O)c1[N+](=O)[O-], O=C1CCCC(=O)C1 to produce CC(C)(C)CNc1c(Br)ccc(C(=O)OC2=CC(=O)CCC2)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.