5-Chloro-2-(6-methylpyridin-3-yl)-3-(2,3,5,6-tetradeuterio-4-methylsulfonylphenyl)pyridine,5-Chloro-6'-methyl-3-(4-(methylsulfonyl)phenyl-2,3,5,6-d4)-2,3'-bipyridine,"Labeled Etoricoxib, intended for use as an internal standard for the quantification of Etoricoxib by GC- or LC-mass spectrometry.",Etoricoxib Stable Isotopes