An<unk>  is a type of steroid derivative which has one of the carbon atoms in the steroid ring system replaced by a nitrogen atom. Two<unk> s, finasteride and dutasteride, are used clinically as 5α-reductase inhibitors. Finasteride and dutasteride, two<unk>  pharmaceutical drugs. The nitrogen atoms in each ring system are highlighted in red. Some of the 6-azasteroids may prove to be useful drugs, but have yet to reach the pharmaceutical market.
Azasteroid
Pectus
Muscular triangle
Ainhum
Airtraq
Abductor wedge
Diaphragm 
Favus