Atorvastatin Related Compound B, CAS 887196-25-0, é o sal de cálcio do estereoisômero (3S,5R) da atorvastatina, correspondendo a Calcium salt-C66H68CaF2N4O10 e Free Base-C33H35FN2O5, com massas moleculares de 1155.34 g/mol e 558.64 g/mol, respectivamente. Esta impureza é um isómero diastereomérico, e não uma classe de degradante por fragmentação covalente. Pode formar-se durante a síntese assimétrica ou por epimerização estereoquímica no motivo 3,5-diidroxiheptanoato. A identificação e a quantificação normalmente exigem LC-MS em fase reversa, LC-MS/MS e cromatografia quiral, com RMN para atribuição estereoquímica e confirmação de conteúdo isomérico em níveis vestigiais.
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