Keywords: Menadione-3D-balls.png Ball-and-stick model of the menadione molecule Derived from File 1 4-benzoquinone-3D-balls png File Hydroquinone-3D-balls png and File L-valine-3D-balls png 2010-07-15 Jynto and Ben Mills Naphthoquinones Vitamin K Images by Jynto |