Forodesine

Forodesine (INN; also known as Immucillin H) is a transition-state analog inhibitor of purine nucleoside phosphorylase under development for the treatment of relapsed B-cell chronic lymphocytic leukemia
Immucillin H was originally discovered by Vern Schramm's laboratory at the Albert Einstein College of Medicine in New York and Industrial Research Limited in New Zealand.