Figotinib maleate is a selective active JAK1 inhibitor, with IC50 values of 10nM, 28nM, 810nM, and 116nM for JAK1, JAK2, JAK3, and TYK2, respectively. Felgotinib (maleic acid) can be used for research on rheumatoid arthritis (RA) and Crohn's disease [1] [2].