17795-21-0 1H-Pyrazolo[3,4-d]pyrimidin-4-ol, monosodium salt 4H-Pyrazolo[3,4-d]pyrimidin-4-one, 1,5-dihydro-, monosodium salt Allopurinol sodium salt Allopurinol, sodium deriv. NSC108836 Sodium allopurinol