1H-Pyridazino(4,5-b)indole-1,4(5H)-dione, 2,3-dihydro- 2,3-Dihydro-1H-pyridazino(4,5-b)indole-1,4(5H)-dione 4-26-00-00601 (Beilstein Handbook Reference) 80985-55-3 BRN 0017487