Following The United States Pharmacopeia (USP, a nonprofit organization committed to establishing standards for medicines, food, dietary supplements, etc.) approach, compounds can be divided into seven categories with respect to their solubilities ratios . We converted the molar fractions into molar ratios under fixed temperature (293.15 K) and attributed them to one of seven USP classes (Table ). The pie chart demonstrating the distribution of USP classes is given in Figure . One can see that six out of seven classes are well-represented in the dataset, the exception is "Very soluble" class which is presented only by 39 records (0.98% of total records at 293.15 K).