Not available,2-butyl-5-chloro-3-[[4-[2-(2H-tetrazol-5-yl)phenyl]phenyl]methyl]imidazole-4-carboxylic acid,"Labeled Losartan, intended for use as an internal standard for the quantification of Losartan by GC- or LC-mass spectrometry.",Losartan Stable Isotopes