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'Ergocalciferol'
Ergocalciferol
Systematic name	(3β,5Z,7E,22E)-9,10-secoergosta-5,7,10(19),22-tetraen-3-ol
Other names	Drisdol (Sanofi-Synthelabo) 1.25 mg (50,000 IU)
	Vitamin D2
Chemical formula	C28H44O
Molecular mass	396.65 g/mol
Density	? g/cm3
Melting point	114-118 °C
CAS number	[50-14-6]

'Ergocalciferol' (Deltalin®, Eli Lilly and Company) is a form of Vitamin D, also called 'vitamin D2'. It has the systematic name "(3β,5Z,7E,22E)-9,10-secoergosta-5,7,10(19),22-tetraen-3-ol". It is created from viosterol, which in turn is created when ultraviolet light activates ergosterol.

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