492447-39-9 Pyridazino[3,4-g]cinnoline-4,9-dicarbonitrile,3,8-diamino-1,2,5,6,7,10-hexahydro-5,10-dioxo-2,7-diphenyl- 492447-43-5 Pyridazino[3,4-g]cinnoline-4,9-dicarboxylic acid,1,2,5,6,7,10-hexahydro-3,8-dihydroxy-5,10-dioxo-2,7-diphenyl-, diethylester