Using COC(=O)C(=O)c1ccc(OCCOc2cc(OC)c(OC)c(OC)c2)cc1 to produce COc1cc(OCCOc2ccc(C(=O)C(=O)O)cc2)cc(OC)c1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.