Using OO, COc1c(C)c(Cc2cccc(OCc3ccccc3)c2C=O)c(OC)c(OC)c1OC to produce COc1c(C)c(Cc2cccc(OCc3ccccc3)c2C(=O)O)c(OC)c(OC)c1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.