| abstract |
The present invention comprises hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, malonic acid, maleic acid, tartaric acid, methane sulfonic acid, benzene sulfonic acid and toluene sulfonic acid, which can be used as an active pharmaceutical ingredient. One acid selected from the group and (S) -7- (2-methoxy-3,5-dimethylpyridin-4-yl) -1- (tetrahydrofuran-3-yl) -1H-pyrazolo [4,3 -C] A quinolin-4 (5H) -one and a salt thereof or a crystal thereof. |