Ravoxertinib hydrochloride is an orally bioavailable and selective inhibitor for ERK kinase activity (IC50: 6.1 nM and 3.1 nM for ERK1 and ERK2, respectively).
Impurity of Doxercalciferol is an impurity of doxercalciferol, a synthetic analog of ergocalciferol used as a drug for secondary hyperparathyroidism and metabolic bone disease, and it suppresses parathyroid synthesis.