NSP-1047 potently inhibits the expression of multiple immune checkpoint proteins, including PD-1, Tim-3, and Lag-3, and it also inhibits the secretion of several inflammatory cytokines, such as IL-6, IL-8 and IL-10. NSP-1047 displays excellent ADME and pharmacokinetic properties, and demonstrates potent in vivo antitumor activity in acute myeloid leukemia animal models with tumor regression.