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(24S)-3β-Hydroxyergost-5-en-7-one is a secondary metabolite found in the fruiting bodies of Cyttaria johowii. (24S)-3β-Hydroxyergost-5-en-7-one is a derivative of Ergosterol (E599240) which is the most important of the provitamins D. Ergosterol is usually obtained from yeast, synthesized from simple sugars such as glucose.