Using COc1ccc(C2(C(=O)O)CCOCC2)cc1Br, CCOC(=O)CC(=O)OCC to produce CCOC(=O)C(C(=O)OCC)C(=O)C1(c2ccc(OC)c(Br)c2)CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.