Patent ID: 9567298
Date: 2017-02-14
CPC Classifications: A61K,A61P,C07B,C07D

Claim:
1. A crystal form I of the compound of formula A structured as follows, wherein an X-ray powder diffraction spectrum radiated by Cu-Kα and characterized in degrees 2θ has following characteristic peaks at 8.17±0.20°, 13.53±0.20°, 16.67±0.20°, 18.13±0.20°, 19.14±0.20°, 19.57±0.20°, 20.26±0.20°, 22.32±0.20°, 23.05±0.20°, 23.77±0.20°, 25.03±0.20°, 27.69±0.20° and 30.99±0.20°.