4-[ethyl({1-[4-(D3)methoxyphenyl]propan-2-yl})amino]butan-1-ol,4-(ethyl(1-(4-(methoxy-d3)phenyl)propan-2-yl)amino)butan-1-ol,"Labeled Mebeverine, intended for use as an internal standard for the quantification of Mebeverine by GC- or LC-mass spectrometry.",Mebeverine Stable Isotopes