Using COC(=O)c1ccc(Br)c(NCC(C)(C)C)c1[N+](=O)[O-] to produce CC(C)(C)CNc1c(Br)ccc(C(=O)O)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.