The parent substance of sitosterol.
Synonym(s): sitostane
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Results: Three friedelolactones with naturally occurring seco-ring-A friedelane triterpenoids, 2/l-hydroxy-3, 4-seco-friedelolactone-27-oic acid (1), 2[beta], 2[beta]-dihydroxy-3,4-seco-friedelolactone-27-oic acid (2) and 2[beta], 30[beta]-dihydroxy-3,4-seco-friedelolactone-27-lactone (3), and a stigmastane, stigmast-25-ene- 3[beta],5[alpha],6[beta]-triol (11) together with nine known compounds were isolated from the whole plant of Viola diffusa G.
Here, we isolated of three new friedelolactones, violaic A (1), violaic B (2) and violalide (3), a new stigmastane, stigmast-25-ene-3[beta],5[alpha], 6[beta]-triol (11), and nine known compounds, epifriedelanol (4), friedelin (5), derosterol (6), derosterol galactoside (7), decorinone (8), decortinol (9), isodecortinol (10), cerevisterol (12) and palmitic acid (13) (Fig.