Using O=C1OC(=O)c2ccccc21, Brc1cccc(-c2ccc3ccccc3c2)c1 to produce O=C(O)c1ccccc1C(=O)c1cccc(-c2ccccc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.