Using CSc1ccc(-c2c(-c3ccccc3)sc(CO)c2CC(=O)O)cc1 to produce CSc1ccc(-c2c(-c3ccccc3)sc3c2CC(=O)OC3)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.