CPC C07D 498/04 (2013.01) [C07B 2200/13 (2013.01)] | 6 Claims |
1. A crystal form A of a compound represented by formula (I), wherein the crystal form A has a X-ray powder diffraction pattern comprising characteristic diffraction peaks with the following angles 2θ: 8.04°±0.2°, 16.52°±0.2° and 19.52°±0.2°,
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