Synonyms: 6H-Purin-6-one,1,2,3,7-tetrahydro-2-thioxo- (9CI);Xanthine, 2-thio- (6CI,7CI,8CI);2,3-Dihydro-2-thioxo-9H-purin-6(1H)-one;2-Mercapto-6-hydroxypurine;2-Mercaptohypoxanthine;2-Thio-6-hydroxypurine;2-Thioxanthine;6-Hydroxy-2-mercaptopurine;6-Hydroxypurine-2-thiol;NSC 36822;NSC 680828;