Using COC(=O)c1ccc(C(O)c2ccc3cc(OC)ccc3c2)cc1 to produce COC(=O)c1ccc(Cc2ccc3cc(OC)ccc3c2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.