Hetro Aromatic Building Blocks
- Pyrroles
- Quinolines
- Pyrazines
- Pyridines
- Benzoxazoles
- Indoles
- Quinazolines
- Triazines
- Benzofurans
- Thiophene
- Benzodioxans
- Quinoxalines
- Pyrazoles
- Benzothiazoles
- Benzisoxazole
- Furans
- Isoquinoline
- Pyridazines
- Isothiazoles
- Pyrimidines
- Thiazoles
- Isoxazoles
- Purines
- Phthalazines
- Benzimidazole
- Indazoles
- Naphthyridines
- 1,2,4-Triazine
- 1,2,4,5-Tetrazines
- Tetrazoles
- Pyrrolo[2,3-b]pyridine
- Indolizine
- Imidazo[1,2-a]pyridine
- 1,2,3-Oxadiazine
- Oxazole
- Oxadiazole
- Triazines
- Imidazoles
- Thiadiazoles
- Triazoles
- Imidazo[1,2-a]pyrimidine
- Oxadiazoles