TERPENOIDS AND STEROIDS 



145 



The heart poisons of Calotropis procera cannot truly be called glycosides since instead of 

 a sugar residue they have methylreductic acid. This compound is, however, closely re- 

 lated to the sugars: 



OH OH 



Examples of some cardiac glycosides with their occurrence are given below. The name of 

 the aglycone follows the name of the glycoside. 



RHAMNOSE 



convallatoxin, strophanthidin 

 (Convallaria majalis) 



DIG-ITOXOSE 



I 

 DIGITOXOSE 

 \ 

 ACETYL-DI&ITOXOSE 



I 

 &LUCOSE 



digilanide A, digitoxigenin 

 (Digitalis purpurea) 



SARMENTOSE 



sarmentocymarin, sarmentogenin 

 (Strophanthus spp.^ 



