Cholestenes
Encyclopedia
Double bond
A double bond in chemistry is a chemical bond between two chemical elements involving four bonding electrons instead of the usual two. The most common double bond, that between two carbon atoms, can be found in alkenes. Many types of double bonds between two different elements exist, for example in...
. One of the most significant cholestenes is cholecalciferol
Cholecalciferol
Cholecalciferol is a form of vitamin D, also called vitamin D3 or calciol.It is structurally similar to steroids such as testosterone, cholesterol, and cortisol .-Forms:Vitamin D3 has several forms:...
.
If there are two double bonds, the molecule is known as a "cholestadiene". Examples include fusidic acid
Fusidic acid
Fusidic acid is a bacteriostatic antibiotic that is often used topically in creams and eyedrops, but may also be given systemically as tablets or injections...
, lanosterol
Lanosterol
Lanosterol is a tetracyclic triterpenoid, which is the compound from which all steroids are derived.-Role in creation of steroids:Elaboration of lanosterol under enzyme catalysis leads to the core structure of steroids. 14-Demethylation of lanosterol by CYP51 eventually yields...
, and stigmasterol
Stigmasterol
Stigmasterol is one of a group of plant sterols, or phytosterols, that include beta-sitosterol, campesterol, ergosterol , brassicasterol, delta-7-stigmasterol and delta-7-avenasterol, that are chemically similar to animal cholesterol...
.