| 摘要 |
<p>The present invention provides a process for the production of highly pure 6,7-dichloro-5-nitro-2,3-dihydroquinoxaline-2,3-dione, wherein the crude 6,7-dichloro-5-nitro-2,3-dihydroquinoxaline-2,3-dione is recrystallized from solution of highly polar solvents and water.</p> |
