Using CCCC(CC(=O)OC)(c1ccc(OC)cc1)c1ccc(OC)cc1 to produce CCCC(CC(=O)O)(c1ccc(OC)cc1)c1ccc(OC)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.