Ethanamine, 2-[4-[(1Z)-1,2-diphenyl-1-butenyl]phenoxy]-N-methyl-N-(methyl-d3),(2โ{4โ[(1Z)โ1,2โDiphenylbutโ1โenโ1โ yl]phenoxy}ethyl)(D3)methylmethylamine,"Labeled Tamoxifen, intended for use as an internal standard for the quantification of Tamoxifen by GC- or LC-mass spectrometry.",Tamoxifen Stable Isotopes