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CAS 41239-91-3 appears in our catalog under these names: Mesna Impurity 2 (2-Bromaethansulfonic Acid Ethyl Ester), Mesna Impurity 7. Offered by: Chemat Brand, Hubei YoungXin. Available pack sizes: on request, 10mg, 25mg, 50mg, 100mg, 200mg.