Mexiletine-D6 (CAS 1330267-50-9) is an isotopically labeled impurity of mexiletine in which six hydrogen atoms are substituted with deuterium. This deuterated analogue exhibits a predictable mass shift of +6 Da, simplified mass spectral interpretation, and characteristic 1H NMR signal attenuation consistent with deuterium incorporation. Supplied as a well-characterized impurity, typical quality control data include high isotopic enrichment, confirmed molecular ion by LC-MS, retention time comparison by HPLC, and purity assessment by NMR and GC or HPLC. Stability under standard storage conditions and certificate of analysis reporting lot-specific analytical data are provided to support trace-level impurity identification and method development.
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