Using CCOC(OCC)OCC, O=C(O)c1ccc2c(c1)CCc1ccccc1C2=O to produce CCOC(=O)c1ccc2c(c1)CCc1ccccc1C2=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.