Acknowledgment. The author wishes to express gratitude to Dr. RE Strube for the encouragement of this work and to the US Army Medicinal Research and Development Command for their financial support. This work was performed under Contract No. DADA17- 71-C-1038 and is Contribution No. 1217 from the Army Fk-search Program on Malaria.
![5',6'-dimethoxy-3',4'-dihydro-1'H-spiro[imidazolidine-4,2'-naphthalene]-2,5-dione结构式](https://image.chemsrc.com/caspic/392/52644-02-7.png)