REFERENCES 37 



that they can be converted into the furanoid oxides (e.g. flavoxanthin, etc.^) 

 under the influence of acids present in the plant. 



REFERENCES 



1. R. WiLLSTATTER and W. MiEG, Ann. 355 (1907) i. 



2. P. Karrer, a. Helfenstein, H. Wehrli and A. Wettstein, Helv. Chim. Acta 13 

 (1930) 1084. 



3. P. Karrer and E. Jucker, Helv. Chim. Acta 28 (1945) 304. 



