
Stigmasterol (also known as Wulzen anti-stiffness factor) is one of a group of plant sterols, or phytosterols, that include β-sitosterol, campesterol, ergosterol (provitamin D2), brassicasterol, delta-7-stigmasterol and delta-7-avenasterol, that are chemically similar to animal cholesterol. Phytosterols are insoluble in water but soluble in most ...
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http://en.wikipedia.org/wiki/Stigmasterol

<chemical> Chemical name: Stigmasta-5,22-dien-3-ol, (3beta,22E)- ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973

a crystalline, water-insoluble steroid, CHO, present in soybeans or calabar beans, used chiefly as a raw material in the manufacture of progesterone.
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https://www.infoplease.com/dictionary/stigmasterol
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