Using CC(C)(C)OC(=O)[C@H](O)[C@@H](O)C(=O)OC(c1ccccc1)c1ccccc1, CCOC(=O)C(Br)(Br)C(=O)OCC to produce CCOC(=O)C1(C(=O)OCC)O[C@@H](C(=O)OC(c2ccccc2)c2ccccc2)[C@H](C(=O)OC(C)(C)C)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.