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