Category:TP3O

Bufanolides (C24)

Bufadienolides are found in toad skin secretions, sea onion or squill (Scilla maritima), and more recently, Crassulaceae in South Africa and Australia. The backbone is a δ-lactone ring at C-17. As for cardenolides, 14β, 17β, and 20R-configurations are assumed (the rings C/D are cis). They naturally occur as glycosides or conjugates of suberylarginine.

Gorgostane (C30)

Gorgostanes occur in marine organisms. Its backbone is ergostane with an additional metyl group at C-23 and ana methylene bridge between C-22 and C-23.