CAS 50-66-8 appears in our catalog under these names: 6–Methylmercaptopurine, 6-Methylmercaptopurine, >95% (HPLC), 6-Methylmercaptopurine, 6-(Methylthio)purine, 98%, 6-(Methylthio)purine 97%. Offered by: GLPBio, TRC, Biosynth, Thermo Scientific (Acros), Ambeed. Available pack sizes: 50mg, 10mg, 1g, 250mg, 100mg, 2g, 5g, 10g.