Vitamin K1-d7,"2-(methyl-d3)-3-((7R,11R,E)-3,7,11,15-tetramethylhexadec-2-en-1-yl)naphthalene-1,4-dione-5,6,7,8-d4","Labeled Phylloquinone, intended for use as an internal standard for the quantification of Phylloquinone by GC- or LC-mass spectrometry.",Phytonadione Stable Isotopes