CAS 51-52-5 appears in our catalog under these names: Propylthiouracil, >95% (HPLC), 6-Propyl-2-thiouracil, Propylthiouracil, Propylthiouracil/ 99.94% (existing batch purity), 6-Propyl-2-thiouracil, >99.0%(T). Offered by: TRC, Dr. Ehrenstorfer, Mikromol, LoGiCal, TargetMol. Available pack sizes: 10g, 1g, 50g, 250mg, 10mg, 25mg, 50mg, 100mg.