ergosterol
noun
er·gos·ter·ol
(ˌ)ər-ˈgä-stə-ˌrȯl
-ˌrōl
: a crystalline steroid alcohol C28H44O that occurs especially in yeast, molds, and ergot and is converted by ultraviolet irradiation ultimately into vitamin D2
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Merriam-Webster unabridged
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