Using OC1CCOC1, CS(=O)(=O)c1ccc(C(=O)O)c(Cl)c1CBr to produce CS(=O)(=O)c1ccc(C(=O)O)c(Cl)c1COC1CCOC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.