1-Phenyl-2,3,5,6-tetrahydro-2-thioxo-1H-imidazo(4,5-d)pyridazine-4,7-dione 1-Phenyl-2-mercapto-4,7-dihydroxy-1,3,5,6-tetraazaindene 1H-Imidazo(4,5-d)pyridazine-4,7-dione, 2,3,5,6-tetrahydro-1-phenyl-2-thioxo- 4-26-00-02633 (Beilstein Handbook Reference) 63886-80-6 BRN 0263310 NSC 9346