Fig. 4

(A) The 15 most common level three ATC pharmacological groups, as shown by the number of distinct compounds within each group (black), and overall percentage of occurrence in the EIPAAB database (grey). The x-axis lists the group’s ATC code, while a simplified version of the ATC name is given inside the plot. Note that the total percentage may exceed 100, as each compound may have multiple classifications. (B) The 10 most common compounds in the database overall and for each study motivation (Environmental, Medical, and Basic Research), the code in brackets following the compound name are the level three ATC pharmacological groups associated with the compound