1,5-Dihydro-4H-pyrazolo(3,4-d)pyrimidin-4-one, monosodium salt 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 (8CI)(9CI) ALLOPURINOL SODIUM Allopurinol sodium salt EINECS 241-771-5 NSC 108836 Sodium allopurinol