For terpenoid saponins it starts from squalene, squalene or better in the oxidized form until you get to Lupeol, amirina α and β, taraxsterolo, ie C30, triterpenes in all respects.
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cardiac glycosides: molecules of this group of substances are characterized by the "active" structure represented by a steroid and phenanthrene (a ciclopentanoperidrofenantrene), which is tied at one end and a lactone ring to another, position 3, a sequence of sugars (digitossosio)
is for the presence of these sugars that these molecules are known as cardiac glycosides: 
cardiocinetici Among the drugs, also known as cardio or cardenolidi, include some substances extracted from flowers, digital, common name for several plants of the genus Digitalis the most important of which is Digitalis purpurea, less important than the type lis dawn and Digitalis lanata.
Massimo Capobianco
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