| 摘要 |
The problem to be solved by the present invention is to provide a quinolinone derivative formulation, and its production method, having for its active ingredient the beta crystal form and/or gamma crystal form of the quinolinone derivative represented with chemical formula (I), which is useful as a pharmaceutical, and particularly as an antiallergic, which has superior bioabsorption and stability. The present invention provides a quinolinone derivative, and its production method, having for its active ingredient the beta crystal form and/or gamma crystal form of the quinolinone derivative represented with chemical formula (I):
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