1,4,5,7-Tetrahydro-4-thioxo-6H-pyrazolo(3,4-D)pyrimidin-6-one 132786-97-1 4-Hydroxy-6-mercaptopyrazolo(3,4-d)pyrimidine 4-Thio-6-hydroxypyrazolo(3,4-d)pyrimidine 5334-33-8 6H-Pyrazolo(3,4-d)pyrimidin-6-one, 1,4,5,7-tetrahydro-4-thioxo- NSC 1404 Oxithiopurinol