Using O=C([O-])[O-], Cc1cc(=O)[nH]cc1C(=O)CC(c1ccc(Br)cc1)c1ccccc1C to produce Cc1cc(=O)n(C)cc1C(=O)CC(c1ccc(Br)cc1)c1ccccc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.