CAS 854898-53-6 (free base) appears in our catalog under these names: Rosuvastatin (6S)-Isomer Calcium Salt discontinued see RM-R192294, Rosuvastatin Impurity 7, Rosuvastatin Impurity 7(Calcium Salt). Offered by: Chemat Brand, Hubei YoungXin. Available pack sizes: on request, 10mg, 25mg, 50mg, 100mg, 200mg.