PR-104, like TH-302, is a prodrug of nitrogen mustard that has shown some degree of efficacy in adult patients with relapsed/refractory acute myeloid leukemia (AML). PR-104A (SN 27858) is the alcohol metabolite of phosphate prodrug PR-104. PR-104A is a hypoxia-selective DNA cross-linking agent/DNA-damaging agent and cytotoxin. Therefore, this compound...