Using CCOC(=O)C(C(=O)OCC)c1ccccc1, BrCCOCc1ccccc1 to produce CCOC(=O)C(CCOCc1ccccc1)(C(=O)OCC)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.