Ezatiostat hydrochloride (Telintra, TLK199), a glutathione derivative, binds to and inhibits GSTP1-1 and disrupts the binding of GSTP1-1 to JNK, and it can stimulate the differentiation of primitive cells into mature monocytes, granulocytes, and erythrocytes and prevent the generation of ineffective bone marrow in myelodysplastic syndromes [239]. Here, GSTP1 is linked to myelodysplastic syndrome.