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![Azithromycin CP impurity R; Azithromycin impurity VII (impurity R) [Erythromycin A 9,11-imide ether] 9-deoxy-11-deoxy-9,11-epoxy-9,9 alpha-didehydro-9 alpha-azido-homoerythromycin A](/upload/image/thumb/2_600_600_20250318202503181048.jpg)
Rifepristal impurity S
