4-[4-[[4-chloro-3-(trifluoromethyl)phenyl]carbamoylamino]phenoxy]-N-(trideuterio(1ยนยณC)methyl)pyridine-2-carboxamide,4-(4-(3-(4-Chloro-3-(trifluoromethyl)phenyl)ureido)phenoxy)-N-(methyl-13C-d3)picolinamide,"Labeled Sorafenib, intended for use as an internal standard for the quantification of Sorafenib by GC- or LC-mass spectrometry.",Sorafenib Stable Isotopes