Atorvastatin Related Compound A, auch Desfluoroatorvastatin und Atorvastatin EP Impurity A genannt, ist das Calciumsalz eines fluoridfreien Atorvastatin-Analogons, CAS 433289-83-9. Die Summenformel lautet als Calciumsalz C66H70CaN4O10 und als freie Base C33H36N2O5, bei einer Molekülmasse von 1119,38 g/mol für das Calciumsalz und 540,65 g/mol für die neutrale Spezies. Diese prozess- oder syntheseassoziierte Verunreinigung entsteht durch den Ersatz des para-fluorierten Phenylmotivs durch einen unsubstituierten Phenylrest. Die Bestimmung erfordert üblicherweise LC-MS/MS mit chromatographischer Trennung von Atorvastatin und verwandten Spezies; zur Strukturabsicherung werden häufig HRMS und NMR eingesetzt.
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