An organic sodium salt that is the monosodium salt of menadione sulfonate. A synthetic naphthoquinone without the isoprenoid side chain and biological activity, but can be converted into active vitamin K2, menaquinone, after alkylation in vivo. ChEBI: Menadione sodium sulfonate is an organic sodium salt that is the monosodium salt of menadione sulfonate. A synthetic naphthoquinone without the isoprenoid side chain and biological activity, but can be converted into active vitamin K2, menaquinone, after alkylation in vivo. It contains a menadione sulfonate. It is functionally related to a menadione.