It is sometimes called vitamin k3, although derivatives of naphthoquinone without the side chain in the 3-position cannot exert all the functions of the K Vitamins. Menadione is a vitamin precursor of K2 which utilizes alkylation to yield menaquinones (MK-n, n=1-13; K2 vitamers), and hence, is better classified as a provitamin.
It is also known as "menaphthone".
| ITEM | STANDARD |
| APPEARANCE | Yellowish crystalline powder |
| PURITY(%) | >= 96.0 TEST METHOD UV |
| MENADIONE (%) | >= 43.0 TEST METHOD UV |
| Nicotinamide (%) | >=31.0 TEST METHOD UV |
| WATER (%) | =< 1.5 TEST METHOD Karl Fisher |
| Heavy metals(Pb) (%) | =<0.002 |