A dimethylated arsenic linked to glutathione with anticancer activities; cytotoxic to DU145, LNCap, PC3 prostate cancer cells (IC50s = 5-10 μM) and patient-derived primary prostate cancer cells (IC50s = 2.5-20 μM), as well as Jurkat T cell lymphoma and L540 Hodgkin lymphoma cells (IC50s = 2.7 and 1.3 μM, respectively); decreases transcription of Gli-2 at 1.5 but not 3 μM; reduces tumor growth in DU145 and PC3 prostate cancer mouse xenograft models at 100 mg/kg every other day