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Three stable and simple synthetic routes of labeled D9‐Mabuterol, D9‐Bambuterol, and D9‐Cimbuterol were described with 98.5%, 99.7%, and 98.4% isotopic abundance and good purity. These structures and isotope‐abundance were confirmed according to 1H NMR and liquid chromatography‐tandem mass spectrometry.
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Tu et al. (2016) studied this question.
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