| CPC C07D 405/14 (2013.01) [C07B 2200/13 (2013.01)] | 20 Claims |

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1. Crystal form B of a compound of formula (1), characterized by an X-ray powder diffraction pattern comprising characteristic peaks at 11.9±0.2°, 14.0±0.2°, 15.2±0.2°, 17.2±0.2°, 17.5±0.2°, and 21.5±0.2° expressed as 2θ angles using Cu-Kα radiation;
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