| CPC C07D 471/04 (2013.01) [A61P 35/00 (2018.01); C07B 2200/13 (2013.01)] | 9 Claims |
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1. A crystal of a compound of formula I,
![]() wherein, in an X-ray powder diffraction pattern using Cu Kα radiation, diffraction peaks exist at 2θ of 13.47°±0.2°, 15.32°±0.2°, 15.98°±0.2°, 18.68°±0.2°, 23.11°±0.2° and 26.41°±0.2°.
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