Using O=C(O)c1ccc(Br)cc1C(=O)c1ccccc1, CCOC(=O)C(Br)C(=O)OCC to produce O=C(O)C1=C(c2ccccc2)c2cc(Br)ccc2CO1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.