methoxyphenol,4-(2-((3-((9H-Carbazol-4-yl)oxy)-2-hydroxypropyl-1,1,2,3,3-d5)amino)ethoxy)-3-methoxyphenol,"Labeled Carvedilol, intended for use as an internal standard for the quantification of Carvedilol by GC- or LC-mass spectrometry.",Carvedilol Stable Isotopes