Abstract
1. An adduct compound of β-eleostearic acid ethyl ester and acrolein having cyclo- hexene ring in its molecule was obtained. This showed clear toxicity when rats were fed on basal diet containing 10 per cent of it.
2. An intramolecular cyclic compound obtained by heating β-eleostearic acid ethyl ester were found also quite toxic to rats.
3. The cyclic constituents in the above substances were confirmed by infrared absorp- tion spectrum and other several properties.
The author expresses his heartfelt thanks to Dr. K. Kodama, President of Tokushima University, for his continual guidance given in the course of this experiment. Deep appreciation is expressed to Dr. S. Tanaka of Tokyo University's Over-all Research Laboratory for his assistance in the infrared spectrum research. Thanks are also due to Mr. K. Kuwa-moto for his cooperation in the experiment.
