tisopurine tisopurine tisopurine (or thiopurinol) is a drug used in the treatment of gout in some countries. it reduces uric acid production through inhibiting an early stage in its production. tisopurineclinical dataahfs/drugs.cominternational drug namesatc codem04aa02 (who) identifiers iupac name 1,2-dihydro-4h-pyrazolopyrimidine-4-thione cas number5334-23-6 ypubchem cid667510chemspider580886unii79f9i2r16mkeggd07278 ycomptox dashboard (epa)dtxsid90201488 echa infocard100.023.865 chemical and physical dataformulac5h4n4smolar mass152.18 g·mol−13d model (jsmol)interactive image smiles c1c2c(n1)ncnc2s inchi inchi=1s/c5h4n4s/c10-5-3-1-8-9-4(3)6-2-7-5/h1-2h,(h2,6,7,8,9,10)key:pyaopmwcfsvfot-uhfffaoysa-n (verify)