OT-82 is a potent NAMPT Inhibitor that targets the strong dependence of hematological malignancies on NAD biosynthesis. OT-82 showed strong efficacy against hematopoietic malignancies including acute myeloblastic and lymphoblastic adult and pediatric leukemias, erythroleukemia, multiple myeloma, and Burkitt's lymphoma in vitro and in mouse xenograft models.