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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.
Ergosterol activated by ultraviolet irradiation; vitamin D2.
A solution of irradiated ergosterol in vegetable oil. Synonym: calciferol