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Pronunciation: er′gō-kal-sif′ĕr-ol
Definition: Activated ergosterol, the vitamin D of plant origin; it arises from ultraviolet irradiation of ergosterol, which is cleaved at the 9,10 bond and develops a double bond between C-10 and C-19; used in prophylaxis and treatment of vitamin D deficiency.
Synonym(s): calciferol, ercalciol, viosterol, vitamin D2
Examples: glitazone, GI cocktail, etc.
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