Using CCOC(=O)C=CC(=O)NCc1cc(Br)cc2[nH]c(=O)c(=O)[nH]c12 to produce O=C(O)C=CC(=O)NCc1cc(Br)cc2[nH]c(=O)c(=O)[nH]c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.