Filgotinib (GLPG0634) is a selective JAK1 inhibitor. The IC50 values against JAK1, JAK2, JAK3, and TYK2 are 10 nM, 28 nM, 810 nM, and 116 nM, respectively.

Delgocitinib (JTE-052) is a specific JAK (Janus kinase) inhibitor with IC50 values of 2.8, 2.6, 13, and 58 nM for JAK1, JAK2, JAK3, and Tyk2 respectively. Delgocitinib is involved in various inflammatory and autoimmune diseases through JAK-dependent cytokines, and can effectively suppress multiple cytokine signaling while inhibiting itching caused by cytokines. It is widely used to treat various inflammatory diseases, including autoimmune diseases and hypersensitivity reactions.

NVP-BSK805 2HCl (1092499-93-8(free base)) (BSK 805)(IC50=0.5 nM), a specific and effective ATP-competitive JAK2 inhibitor, is more than 20-fold specificity over JAK1, JAK3 and TYK2.

Cerdulatinib hydrochloride (PRT2070 hydrochloride) is an oral active, multi-targeted tyrosine kinase inhibitor with IC50 of 12 nM/6 nM/8 nM/0.5 nM and 32 nM for JAK1/JAK2/JAK3/TYK2 and Syk, respectively. Also inhibits 19 other tested kinases with IC50 less than 200 nM.

Beta-Hydroxyisovalerylshikonin is an inhibitor of protein-tyrosine kinases such as v-Src and EGFR, and has been shown to induce apoptosis in several human tumor cell lines. Beta-Hydroxyisovalerylshikonin significantly decreased viability of HCT116 cells (IC50 values = 30.9 μg/mL).