The present invention relates to the compound of the formulaor pharmaceutically acceptable salts thereof, as well as compositions containing said compound, processes for the preparation thereof, and therapeutic methods of use therefore in promoting hydration of mucosal surfaces and the treatment of diseases including chronic obstructive pulmonary disease (COPD), asthma, bronchiectasis, acute and chronic bronchitis, cystic fibrosis, emphysema, and pneumonia.
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