A potent ATP mimetic that inhibits JAK1 and JAK2 with IC50 values of 2.7 and 4.5 nM, respectively; less selective for JAK3 (IC50 = 322 nM); blocks IL-6 signaling (IC50 = 281 nM) and proliferation of JAK2V617F+ Ba/F3 cells (IC50 = 127 nM); reduces splenomegaly, decreases circulating levels of IL-6 and TNF-α, eliminates neoplastic cells, and prolongs survival in a mouse model of JAK2V617F+ MPN,