Amoxicilloic Acid Dimer는 diastereomer 혼합물로 기술되며 Amoxicilloic Amoxilloic Acid Dimers 1, 2, 3, and 4로도 불리는 CAS 297175-66-7의 penicillanic acid 계열 이량체 불순물로, amoxicillin의 가수분해 분해와 연관된다. 분자식 C31H40N6O9S2, 분자량 704.81 g/mol은 황을 포함하는 β-lactam 유래 화합물이며 여러 입체중심으로 인해 diastereomer적 복잡성을 갖는다. 생성은 저장 또는 공정 중 수성 스트레스에서 β-lactam 고리 개환 후 acyl side chain 결합과 일치한다. 검출 및 정량에는 일반적으로 LC-MS/MS, 고분해능 질량분석, 그리고 이성질체 분리를 위한 역상 또는 키랄 LC가 필요하며, 구조 확인에는 NMR이 보조적으로 사용된다. penicillin 분해산으로서 규제상 의미가 있다.
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