在合成标题化合物的基础上，测定了其晶体结构．由于苯环邻位取代基的差异，导致了两者在空间构象上的极大差异，从而引起它们生物活性的绝然不同．与磺酰脲类除草剂的晶体结构进行比较后发现，这两类除草剂的空间构象与生物活性间的关系是完全一致的，从而进一步说明了它们与ALS可能具有相同的结合位点． Based on the synthesis of the title compound, its crystal structure was determined. Due to the difference of the ortho substituents of benzene ring, it leads to the great difference of the two in the conformation of space, which leads to the absolutely different biological activity. Compared with the crystal structure of sulfonylurea herbicides, we found that the relationship between the spatial conformation and biological activity of the two herbicides is completely consistent, which further shows that they may have the same binding sites with ALS.