Acknowledgment. One of the authors (SI) acknowledges in part the Scientific Research Fund from the Miniistry of Education of Japan for the present work. They are gratefully indebted to Drs. K. Kuretani and A. Hoshi of NCC of Japan for making available the antitumor screening results and valuable discussion. They also thank Miss K. Nakaji of Joint Laboratory of this school for the uv and ir spectral measurements.
![8a-(4-Chlorophenyl)-3,4,8,8a-tetrahydro-2H-pyrrolo[2,1-b][1,3]oxazin-6(7H)-one结构式](https://image.chemsrc.com/caspic/386/7088-16-6.png)