Using O=C([O-])[O-], C=CCC(CC(=O)c1ccc(=O)[nH]c1)c1ccc(Br)cc1 to produce C=CCC(CC(=O)c1ccc(=O)n(C)c1)c1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.