4-[4-[4-(Hydroxydiphenylmethyl)-1-piperidinyl]-1-hydroxybutyl]-ฮฑ,ฮฑ-(dimethyl-d6)phenylacetic Acid,3,3,3-Trideuterio-2-[4-[1-hydroxy-4-[4-[hydroxy(diphenyl)methyl]piperidin-1-yl]butyl]phenyl]-2-(trideuteriomethyl)propanoic acid,"The active labelled metabolite of Terfenadine , a H1-histamine receptor antagonist.;Labeled Fexofenadine, intended for use as an internal standard for the quantification of Fexofenadine by GC- or LC-mass spectrometry.",Fexofenadine Stable Isotopes
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