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US 11,597,722 B2Granted
Crystal form D of pyrazine-2(1H)-ketone compound and preparation method therefor
AssigneeZhangzhou Pien Tze Huang Pharmaceutical Co., Ltd.
InventorsZhiliang Chen, Zhiyi Luo, Yichao Zhuang, Jinxia Lin, Longhui Gao, Zhifei Fu, Miaorong Luo, Yang Zhang, Jian Li, Shuhui Chen
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Abstract
The present invention disclosed a crystal form of pyrazine-2(1H)-ketone compound and a preparation method therefor. Specifically disclosed is a method for preparing a compound of formula (II) and a crystal form thereof.
Claims9
A crystal form D of compound of formula (II), wherein the crystal form D has an X-ray powder diffraction pattern having characteristic diffraction peaks at the following 28 angles:
- 9.42±0.20°, 26.28±0.20°, and 27.72±0.20°.
Dependencies are inferred from the claim text.