944118-01-8

Peficitinb (ASP015K, JNJ-54781532) is a novel oral Janus kinase (JAK) inhibitor. Peficitinib inhibits JAK1, JAK2, JAK3 and Tyk2 enzyme activities with IC50s of 3.9, 5.0, 0.71 and 4.8 nM, respectively, and has moderate selectivity for JAK3 inhibition.