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CAS 40554-78-7 appears in our catalog under these names: Erythromycin Impurity 7, Erythromycin Impurity 49, 11-Dehydroxy Erythromycin A. Offered by: Hubei YoungXin, Chemat Brand. Available pack sizes: 10mg, 25mg, 50mg, 100mg, 200mg, on request.