Циклопентанфегидрофенантрен

Cyclopentaneperhydrofenanthrene is an organic substance consisting of three six-membered and one five-membered carbon rings (fully hydrogenated phenanthrene and cyclopentane).

Underlies the structure of the molecules of many biologically and physiologically active substances:

Cholesterol

Bile acids

Steroid hormones

Vitamin D

Cardiotonic glycosides (cardenolides and bufadienolides)