HS-276 is a highly selective, orally active inhibitor of TAK1 (Ki: 2.5 nM). HS-276 significantly inhibits TAK1 (IC50: 8.25 nM), CLK2 (IC50: 29 nM), GCK (IC50: 22 nM), ULK2 (IC50: 63 nM), MAP4K5 (IC50. HS-276 can be used to study rheumatoid arthritis (RA).

A potent and selective p38α kinase inhibitor with IC50 of 9 nM; shows 20-fold selectivity for p38α over p38β (Ki=220 nM) and no significant inhibition for MAP kinases (with the exception of MKK6).

SB 202190 (SB202190, SB-202190) is a potent inhibitor p38α and p38β with IC50 of 50 nM and 100 nM respectively.