Part 1. Three- and four-membered heterocycles. Epoxides and aziridines
Part 2. Five-membered heterocycles. Pyrroles and pyrrolidines ; Indoles ; Furans ; Thiophenes ; Oxazoles and isoxazoles ; Other five-membered heterocycles
Part 3. Six-membered heterocycles. Pyridines ; Quinolines and isoquinolines ; Other six-membered heterocycles.