CPC C07D 498/04 (2013.01) [C07B 2200/13 (2013.01)] | 14 Claims |
1. A crystal form A of a compound of formula (I), wherein the crystal form has an X-ray powder diffraction pattern comprising characteristic diffraction peaks at the following 2θ angles: 6.30±0.20°, 9.30±0.20°, 9.84±0.20°, 18.68±0.20°, 20.16±0.20°, 23.06±0.20°, 24.00±0.20°, and 25.38±0.20°;
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