Menadione is an organic compound with the formula C6H4(CO)2C2H(CH3). It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position. It is occasionally used as a nutritional supplement in animal feed because of its vitamin K activity.
It is sometimes called vitamin K3, although derivatives of naphthoquinone are not naturally occurring chemicals and therefore do not qualify as vitamins, and without the side chain in the 2-position (which, as the methyl group is retained in vitamin K, ...
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