JAK3 Covalent Inhibitor-1 is a compound characterized by its potent and selective inhibition of Janus kinase 3 (JAK3), possessing an IC50 of 11 nM and demonstrating a 246-fold selectivity compared to other JAKs.
PF-06263276 is an effective and selective inhibitor of pan-JAK. It also has IC50s of 2.2 nM, 23.1 nM, 59.9 nM and 29.7 nM for JAK1, JAK2, JAK3, and TYK2, respectively.