Using O=C(O)CCCCCCCBr, O=C(c1ccccc1)C(O)c1ccccc1 to produce O=C(CCCCCCCBr)OC(C(=O)c1ccccc1)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.