Using CCOC(=O)C(C(=O)OCC)C1c2ccccc2CCc2ccccc21 to produce O=C(O)C(C(=O)O)C1c2ccccc2CCc2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.