| abstract |
The invention belongs to the technical field of medicinal chemistry, and in particular relates to two new crystal forms A and B of chlorfenacil and a preparation method thereof. The two crystal forms have good stability and small crystal particle size, which are favorable for the preparation of solid preparations; The crystal form is also easy to prepare on a large scale, is simple to operate, has good safety, is easy to remove impurities, has high purity, and is suitable for industrial production. |