LDN-192960 hydrochloride is an inhibitor of Dual-specificity Tyrosine-regulated Kinase 2 (DYRK2) and Haspin with IC50s of 48 nM and 10 nM, respectively.
Dyrk1A-IN-5 (compound 5j) is a highly potent and selective inhibitor of DYRK1A, exhibiting an IC50 of 6 nM. It dose-dependently diminishes the phosphorylation of Thr434 in SF3B1, with an IC50 of 0.5 μM. Moreover, Dyrk1A-IN-5 effectively inhibits the phosphorylation of tau at Thr212, with an IC50 of 2.1 μM. Given these properties, Dyrk1A-IN-5 is a valuable tool for Down syndrome research [1].