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secosteroid
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 meaning "to cut", and of steroid, meaning "solid, three-dimensional".〔 Secosteroids are alternatively described as a subclass of steroids〔; ; 〕 or derived from steroids.
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.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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