Equilibrium solubility determination, modelling and thermodynamic aspects of 6-chloroguanine in aqueous co-solvent mixtures of N,N-dimethylformamide, isopropanol, 1,4-dioxane and dimethyl sulfoxide Zheng, M.; Xu, R.; Zhao, H.; The Journal of Chemical Thermodynamics 2019, 134, 52-60