riboflavin
noun
ri·bo·fla·vin
ˌrī-bə-ˈflā-vən
ˈrī-bə-ˌflā-
: a yellow crystalline compound C17H20N4O6 of the vitamin B complex that occurs both free (as in milk) and combined (as in liver) as a component of coenzymes (such as FMN) which are essential to normal metabolism
called also vitamin B2
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Merriam-Webster unabridged
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