FLAVONOIDS AND RELATED COMPOUNDS 189 



Isocarthamidin is also formed by a ring closure involving the 6-hydroxy group. 



One of the most interesting of these rather rare compounds is phlorizin, a glucoside 

 of the dihydro-chalcone, phloretin, which causes glycosuria in animals. Phlorizin is 

 also a strong inhibitor of apple seedling growth (32). 



GLUCOSE-O 



structures of some other chalcones with their sources are as follows: 



&LUCOSE-0 



GLUCOSE- 



lanceolin 

 {Coreopsis spp. ) 



salipurposide 

 (Salix purpurea) 



dahlia chalcone 

 (.Dahlia spp. ) 



A rare example of an isodihydrochalcone is angolensin of sandalwood (Pterocarpus 

 angolensis) : 



OCH. 



OH 



