3-(4-Chloro-phenyl)-8-methyl-1-thia-3a,4,9,10-tetraaza-cyclopenta[b]fluorene

1-(4-Chloro-phenyl)-9-methyl-3-thia-4,5,10,10b-tetraaza-cyclopenta[a]fluorene

1-(4-Bromo-phenyl)-9-methyl-3-thia-4,5,10,10b-tetraaza-cyclopenta[a]fluorene

1-Biphenyl-4-yl-9-methyl-3-thia-4,5,10,10b-tetraaza-cyclopenta[a]fluorene

9-Methyl-1-(4-nitro-phenyl)-3-thia-4,5,10,10b-tetraaza-cyclopenta[a]fluorene