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Title: Secosteroid  
Author: World Heritage Encyclopedia
Language: English
Subject: Steroid, List of human hormones, Ergocalciferol, Estrane, Norsteroid
Collection: Secosteroids
Publisher: World Heritage Encyclopedia


Cholecalciferol (vitamin D3), an example of a 9,10-secosteroid. The hydroxyl group (HO-) is in position C3 of the parent steroid A-ring. The triene substructure attached to the ring bearing the hydroxyl group is a result of the ring scission (cleavage) giving rise to this secosteroid.
The parent steroid skeleton. The B-ring of the parent steroid is broken between C9 and C10 to yield the vitamins D.

A secosteroid (sec·o·ster·oid, sek'ō-stēr'oyd) is a type of steroid with a "broken" ring. The word secosteroid derives from the verb Latin: secare meaning "to cut",[1]:241 and Latin: stere of steroid, meaning "solid, three-dimensional".[1]:129 Secosteroids are alternatively described as a subclass of steroids[2] or derived from steroids.[3]

Types or subclasses of secosteroids are defined by the carbon atoms of the parent steroid skeleton where the ring cleavage has taken place. For example, 9,10-secosteroids derived from cleavage of the bond between carbon atoms C9 and C10 of the steroid B-ring (similarly 5,6-secosteroids, 13,14-steroids, etc.).

The prototypical secosteroid is cholecalciferol, vitamin D3.[4]


  1. ^ a b Ayers D (1972). Bioscientific Terminology. Tucson: University of Arizona Press.  
  2. ^ Moss GP and the Working Party of the IUPAC-IUB Joint Commission on Biochemical Nomenclature. "The Nomenclature of Steroids". Queen Mary University of London. p. Section 3S-1 (esp. 3S-1.4, incl. note 4). ; Moss GP (1989). "Nomenclature of Steroids (Recommendations 1989)".  
  3. ^ "Definition of secosteroid". Farlex Partner Medical Dictionary. A compound derived from a steroid in which there has been a ring cleavage. 
  4. ^ Hanson JR (2010). "Steroids: partial synthesis in medicinal chemistry". Nat Prod Rep 27 (6): 887–99.  

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