8-Amino-2-oxo-4-phenyl-1,2-dihydro-1,5,6,8a,9-pentaaza-fluorene-3,7-dicarbonitrile

8-Hydroxy-2-oxo-4-phenyl-1,2-dihydro-1,5,6,8a,9-pentaaza-fluorene-3,7-dicarbonitrile

3-Cyano-8-methyl-2-oxo-4-phenyl-1,2-dihydro-1,5,6,8a,9-pentaaza-fluorene-7-carboxylic acid ethyl ester

pyrido<3',2':4,5>pyrazolo<3,2-c>naphtho<2,1-e>-1,2,4-triazine

7-Acetyl-8-methyl-2-oxo-4-phenyl-1,2-dihydro-1,5,6,8a,9-pentaaza-fluorene-3-carbonitrile