have been published .
The exciton chirality method is also useful for the stereochemical analysis of the
aglycone part in glycosides. Recently, the determination of the absolute stereo-
chemistry of natural 3,4-dihydroxy-ß-iononeglycosides has established the con-
figuration as being 3ß,4ß (3S,4R) .
Furthermore, a lot of ORD and CD spectroscopy has been done in the field of
carotenoid chemistry. In a fundamental paper by Klyne's and Weedon's groups 
ORD spectra of carotenoids have been studied systematically. Extensive CD studies