Cheng, C C Pyrazoles. I. Synthesis of 4-hydroxypyrazolo[3,4-d]-v-triazine. A new analog of hypoxanthine. [electronic resource] - Journal of pharmaceutical sciences Jun 1968 - 1044-5 p. digital Publication Type: Journal Article ISSN: 0022-3549 Standard No.: 10.1002/jps.2600570634 doi Subjects--Topical Terms: AllopurinolHypoxanthinesPyrazoles--chemical synthesisSpectrophotometryTriazines--chemical synthesis