... 411 interesting chemical observation, which may be of biological significance with this type of structure, was the relatively high lability of the fluorine atom substituted on the aromatic ... K. 8. ... ne Picrate, mp 180- 181" from ethanol, very slow even on adding an equal volume of et,her ...
![7,9-dimethyl-8-oxa-2-aza-spiro[4.5]decane-1,3-dione Structure](https://image.chemsrc.com/caspic/250/1078-83-7.png)
![4-(7,9-dimethyl-8-oxa-2-azaspiro[4.5]decan-2-yl)-1-(4-fluorophenyl)butan-1-one Structure](https://image.chemsrc.com/caspic/169/1238-79-5.png)
