Using COC(=O)c1cc(O)cc2c1CC(c1ccc(O)cc1)C1CCCC21 to produce O=C(O)c1cc(O)cc2c1CC(c1ccc(O)cc1)C1CCCC21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.