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The Daiichi Sankyo Company, Limited patent solves the following problem:
Japanese Patent No. 3209946 (Patent Document 1) discloses compounds with neuraminidase inhibitory activity, including the compound represented by formula (I) shown below. The compound represented by formula (I) have excellent neuraminidase inhibitory activity and is expected to be useful as a drug for treating and preventing influenza virus infection. Japanese Patent No. 4205314 (Patent Document 2) revealed a concentration of the compound represented by formula (I) can remain on for a long time in the respiratory tissues like lung (Patent Document 2).
Our analysis of this patent is as follows:
Daiichi Sankyo Company, Limited’s patent US 9339487 B2 deals with Dry powder pharmaceutical composition for inhalation.
There was a dry powder pharmaceutical composition for inhalation is useful for preventing and / or treating influenza virus infections included as a medicinal component of a compound represented by formula (I): and optionally a compound represented by formula (II): a pharmacologically acceptable salt thereof, or a hydrate thereof.
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