alpha Lipoic Acid Impurity D인 β-Lipoic Acid는 CAS 6992-30-9의 치환 위치 이성질체로서, 합성, 분리 또는 저장 중 입체화학적 혹은 공정 유래 이성화에 의해 형성될 수 있다. 이 황 함유 고리형 이황화물 불순물은 분자식 C8H14O3S2, 분자량 222.3 g/mol을 갖는다. 모화합물과 물리화학적 특성이 매우 유사하므로, 분리는 통상 키랄 또는 고분해능 역상 LC를 필요로 하며, 확인에는 LC-MS/MS의 직교적 분석이 요구된다. 규제적 관점에서 이는 유전독성 종이 아니라 구조적으로 관련된 유기 불순물로 평가되며, 동정은 NMR과 질량분석으로 뒷받침된다.
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