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Overlay of chromatograms representing amiloride nasal spray samples assayed after storage in bottles at room temperature. From left to right, chromatograms represent USP reference standard, 0, 3 hrs, 24 hrs, and 7 days samples of 0.2 mg/mL amiloride hydrochloride solutions. Amiloride RS–Amiloride USP reference standard.
