Using CCOC(=O)CC1CCCc2cc(OC3Cc4ccccc4C3)ccc21 to produce O=C(O)CC1CCCc2cc(OC3Cc4ccccc4C3)ccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.