Using COc1ccc2c(c1)C(=O)C(=Cc1ccccc1C(=O)O)C2 to produce COc1ccc2c(c1)C(=O)C(Cc1ccccc1C(=O)O)C2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.