Not Available,9-(Methyl-d3)-3-((2-(methyl-d3)-1H-imidazol-1-yl)methyl)-1,2,3,9-tetrahydro-4H-carbazol-4-one hydrochloride,"Labeled Ondansetron, intended for use as an internal standard for the quantification of Ondansetron by GC- or LC-mass spectrometry.",Ondansetron Stable Isotopes