2-(4-((5,6-diphenylpyrazin-2-yl)(propan-2-yl-d7)amino)butoxy)-N-(methylsulfonyl)acetamide,2-(4-((5,6-diphenylpyrazin-2-yl)(propan-2-yl-d7)amino)butoxy)-N-(methylsulfonyl)acetamide,Labeled Selexipag, intended for use as an internal standard for the quantification of Selexipag by GC- or LC-mass spectrometry.,Selexipag