alpha Lipoic Acid Impurity D, identified as β-Lipoic Acid, CAS 6992-30-9, is a positional isomer of thioctic acid arising from stereochemical or process-related isomerization during synthesis, isolation, or storage. This sulfur-containing cyclic disulfide impurity has molecular formula C8H14O3S2 and molecular weight 222.3 g/mol. Because its physicochemical profile closely parallels the parent compound, separation commonly requires chiral or high-resolution reversed-phase LC with orthogonal LC-MS/MS confirmation. In regulatory impurity profiling, it is evaluated as a structurally related organic impurity rather than a genotoxic species, with identity and assay control supported by NMR and mass spectrometric characterization.
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