CAS 58-27-5 appears in our catalog under these names: Menadione, Menadione (Vitamin K3), Vitamin K3, >95% (HPLC), Menadione/ 99.08% (existing batch purity), 2-Methyl-1,4-naphthoquinone, 98% . Offered by: Mikromol, Dr. Ehrenstorfer, TRC, GLPBio, TargetMol. Available pack sizes: 250mg, 2,5g, 50g, 50mg, 1g, 10g, 10mM (in 1ml dmso), 500mg.