 
        
      Berkatens-d7,4-[(3,4-Dimethoxyphenethyl)methylamino]-2-(3,4-dimethoxyphenyl)-2-(isopropyld7)butyronitrile Monohydrochloride,"Labeled Verapamil, intended for use as an internal standard for the quantification of Verapamil by GC- or LC-mass spectrometry.",Verapamil Stable Isotopes
