A secosteroid is a molecule similar to a steroid but with a "broken" ring. The word is from verb Latin: secare = to cut, - Latin: stere "solid, three-dimensional", - oid, from Ancient Greek: ειδος, eidos "form".
Secosteroids are very similar in structure to steroids except that two of the B-ring carbon atoms (C9 and 10) of the typical four steroid rings are not joined, whereas in steroids they are.
In humans, a well known secosteroid is vitamin D.
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