| CPC C07D 413/14 (2013.01) [A61P 1/16 (2018.01); C07B 2200/13 (2013.01)] | 17 Claims |
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1. A crystalline form of a compound of formula (I), which is crystal form A, characterized by X-ray powder diffraction pattern with characteristic diffraction peaks at the following 2θ angles of 12.72±0.2°, and 25.27±0.2°;
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