CAS 21823-25-6 appears in our catalog under these names: 2-Amino-5-ureido-4,6-pyrimidinedione, 95%, 2-Amino-5-ureido-4,6-pyrimidinedione, >95% (HPLC), 2-Amino-5-ureido-4,6-pyrimidinedione. Offered by: Combi-blocks, TRC, Biosynth. Available pack sizes: 1g, 10g, 5g, 250mg, 100mg, 500mg, 1000mg, 2000mg.