Name Menadione, Vitamin K3 Molecular Formula C11H8O2 Molecular Weight 172.18 CAS No. 58-27-5 EINECS 200-372-6 Despite the fact that it can serve as a precursor to various types of vitamin K, menadione is generally not used as a nutritional supplement. Large doses of menadione have been reported to cause adverse outcomes including hemolytic anemia due to G6PD deficiency, neonatal brain or liver ...