Using CCOc1cc(OCC)cc(OC(C(=O)O)c2ccc(Br)cc2)c1 to produce CCOc1cc(OCC)c2c(c1)OC(c1ccc(Br)cc1)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.