Using [Br-], CC(=O)c1ccc(OCc2ccccc2)c2[nH]c(=O)ccc12 to produce O=C(CBr)c1ccc(OCc2ccccc2)c2[nH]c(=O)ccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.