Using CCOC(=O)CBr, CCCCOC(=O)c1sc2ccc(O)cc2c1OC(=O)C(C)(C)C to produce CCCCOC(=O)c1sc2ccc(OCC(=O)OCC)cc2c1OC(=O)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.