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- 22:15, 10 April 2024 Fire talk contribs created page Ergocalciferols (Q21904) (wbeditentity-create:2|en: Ergocalciferols, Derivatives of ERGOSTEROL formed by ULTRAVIOLET RAYS breaking of the C9-C10 bond. They differ from CHOLECALCIFEROL in having a double bond between C22 and C23 and a methyl group at C24.)