1-Methyl-2-mercapto-4,7-dihydroxy-1,3,5,6-tetrazaindene 1H-Imidazo(4,5-d)pyridazine-4,7-diol, 2-mercapto-1-methyl- 2-Mercapto-1-methyl-1H-imidazo(4,5-d)pyridazine-4,7-diol 4-26-00-02633 (Beilstein Handbook Reference) 5450-59-9 BRN 0209577 NSC 10007