| Member | Definition | Role |
|---|
| 5H-dibenzo[b,f]azepine | A mancude organic heterotricyclic parent that consists of a seven-membered nitrogen hetrocycle fused with two benzene rings. | 5H-dibenzo[b,f]azepine |
| acridines | A polycyclic heteroarene that is anthracene in which one of the central CH groups is replaced by a nitrogen atom. | acridine |
| dibenzo(1,4)dioxin | | oxanthrene |
| dibenzofuran | A mancude organic heterotricyclic parent that consists of a furan ring flanked by two benzene rings ortho-fused across the 2,3- and 4,5-positions. | dibenzofuran |
| dibenzothiophene | A mancude organic heterotricyclic parent that consists of a thiophene ring flanked by two benzene rings ortho-fused across the 2,3- and 4,5-positions. | dibenzothiophene |
| norharman | The parent compound of the beta-carbolines, a tricyclic structure comprising an indole ring system ortho- fused to C-3 and C-4 of a pyridine ring. | beta-carboline |
| phenanthridine | An azaarene that is the 9-aza derivative of phenanthrene. The parent of the class of phenanthridines. | phenanthridine |
| phenazine | An azaarene that is anthracene in which the carbon atoms at positions 9 and 10 are replaced by nitrogen atoms. | phenazine |
| thianthrene | The organosulfur heterocyclic compound that is the parent compound of the thianthrenes, a tricyclic structure comprising two benzene rings fused to the b and e sides of 1,4-dithin. | thianthrene |