CAS 51-21-8 appears in our catalog under these names: Fluorouracil, 5-Fluoro Uracil, >95% (HPLC), 5-Fluorouracil, Fluorouracil (Adrucil), 5-Fluorouracil, 99% . Offered by: Chemat Brand, TRC, Mikromol, LoGiCal, Dr. Ehrenstorfer. Available pack sizes: on request, 100g, 10g, 1g, 250mg, 10mg, 100mg, 200mg.