Using CCCC(=O)c1cc2c(=O)cc(C(=O)OCC)[nH]c2cc1C to produce CCCC(=O)c1cc2c(=O)cc(C(=O)O)[nH]c2cc1C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.