Using CCOC(=O)C(C(=O)OCC)c1c(Br)cnc2c([N+](=O)[O-])cccc12 to produce CCOC(=O)Cc1c(Br)cnc2c([N+](=O)[O-])cccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.