Using COC(=O)C(C(=O)OC(C)(C)C)c1ccc([N+](=O)[O-])c(Br)c1 to produce COC(=O)Cc1ccc([N+](=O)[O-])c(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.