Using COC1OC(=O)c2ccc3cc(C(=O)OCc4ccccc4)ccc3c21 to produce COC1OC(=O)c2ccc3cc(C(=O)O)ccc3c21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.