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  • Secosteroids are a subclass of the tetracyclic steroid class that are structural relatives bearing a cleavage of one of the four rings of that parent class. The subclass nomenclature derives from the verb Latin: secare meaning "to cut", and Latin: stere of steroid, meaning "solid, three-dimensional". Subclasses are defined by the carbon atoms of the parent steroid skeleton where the ring cleavage has taken place, e.g., 9,10-secosteroids for derivatives deriving from cleavage between carbon atoms C9 and C10 of the steroid B-ring. The prototypical secosteroid is cholecalciferol, vitamin D3. Wikipedia

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