CAS 404958-69-6 appears in our catalog under these names: Rosuvastatin Impurity 142, Rosuvastatin Related Compound 4, Rosuvastatin Impurity 88, tert-Butyl (3R,5R)-6-Chloro-5-hydroxy-3-oxohexanoate. Offered by: Chemat Brand, Hubei YoungXin, TRC. Available pack sizes: on request, 10mg, 25mg, 50mg, 100mg, 200mg, 250mg.