AZD7762 is a potent and selective inhibitor of Chk1 with IC50 of 5 nM, being equally potent against Chk2 and less potent against CAM, Yes, Fyn, Lyn, Hck and Lck.

BML-277 is a selective Chk2 (checkpoint kinase 2) inhibitor with IC50 of 15 nM.

LY2606368 (Prexasertib) is a selective Chk1 inhibitor with IC50 value <1nM, modest to Chk2 and Rsk with IC50 values of 8nM and <10nM.