Using COc1cc(Cl)c(C(=O)c2ccc(Cl)cc2Cl)c(Cl)c1 to produce COc1cc(Cl)c(C(O)c2ccc(Cl)cc2Cl)c(Cl)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.