Atorvastatin Related Compound B, CAS 887196-25-0, es la sal cálcica del estereoisómero (3S,5R) de atorvastatina y corresponde a Calcium salt-C66H68CaF2N4O10 y Free Base-C33H35FN2O5, con pesos moleculares de 1155.34 g/mol y 558.64 g/mol, respectivamente. Esta impureza es un isómero diastereomérico, no una clase de degradante por fragmentación covalente. Puede originarse durante la síntesis asimétrica o por epimerización estereoquímica en el motivo 3,5-dihidroxiheptanoato. Su identificación y cuantificación suelen requerir LC-MS en fase reversa, LC-MS/MS y cromatografía quiral, con RMN para la asignación estereoquímica y la verificación de contenido isomérico a nivel traza.
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