CPC C07D 401/04 (2013.01) [C07B 2200/13 (2013.01)] | 13 Claims |
1. A crystal form A of the hydrochloride having a structure shown in formula (II-1), wherein, the X-ray powder diffraction pattern thereof measured by Cu Kα radiation has characteristic diffraction peaks at the following 2θ angles: 14.77±0.20°, 20.50±0.20°, 22.38±0.20° and 24.15±0.20°;
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