CAS 4425-56-3 appears in our catalog under these names: 5–Cyanouracil, 5-Cyanouracil, >98.0%(HPLC), 2,4-Dioxo-1,2,3,4-tetrahydropyrimidine-5-carbonitrile 97%, 2，4-Dioxo-1，2，3，4-tetrahydropyrimidine-5-carbonitrile, 98%, 98%, 2,4-Dihydroxypyrimidine-5-carbonitrile, 98%. Offered by: GLPBio, TCI, Ambeed, Chemat, Fluorochem. Available pack sizes: 1g, 25g, 5g, 100mg, 250mg.