Using CCOC(=O)c1oc(-c2ccc(Cl)cc2)c2ccccc12, O to produce CCOC(=O)C(=O)c1ccccc1C(=O)c1ccc(Cl)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.