Zhangzhou Pien Tze Huang Pharmaceutical Co., Ltd.

Longhui Gao

Shuhui Chen

Jian Li

Zhifei Fu

Miaorong Luo

Fei Hong

Zhiliang Chen

Jinming Huang

Tingting Yin

Jinxia Lin

Yichao Zhuang

Zhiyi Luo

Shicong Wang

A crystal form of a pyrazin-2(1H)-one compound and a preparation method therefor. The present invention specifically related to a compound of formula (II) and a preparation method for a crystal form of the compound. 

Crystal forms C and E of pyrazin-2(1H)-one compound and preparation method therefor

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. 

Crystal form D of pyrazine-2(1H)-ketone compound and preparation method therefor

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Zhangzhou, China

Longhui Gao