Definition

The orally active ethanolamine salt of hetrombopag, a small-molecule, nonpeptide thrombopoietin receptor (TPO-R or CD110) agonist, with megakaryopoiesis-stimulating activity. Upon oral administration, hetrombopag targets, binds to and stimulates the transmembrane domain of the platelet TPO-R, a member of the hematopoietin receptor superfamily. Activation of TPO-R leads to the proliferation and differentiation of cells in the megakaryocytic lineage and an increase in platelet production. This may prevent or treat chemotherapy-induced thrombocytopenia.