Using COc1cc(CCCC(O)c2ccc3c(c2)OCO3)cc(OC)c1OC to produce COc1cc(CCCCc2ccc3c(c2)OCO3)cc(OC)c1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.