| abstract |
The present invention provides a salt produced from at least one acid selected from the group consisting of hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, malonic acid, maleic acid, tartaric acid, methanesulfonic acid, benzenesulfonic acid and toluenesulfonic acid and (S)-7-(2-methoxy-3,5-dimethylpyridin-4-yl)-1- (tetrahydrofuran-3-yl)-1H-pyrazolo[4,3-c]quinolin-4(5H)-one or a crystal of the salt, which can be used as an active ingredient for medicines. |