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Chemical structures of compounds 1–15. 5α-Stigmast-3,6-dione (1), 3β-sitostanol (2), 6α-hydroxy-β-sitostenone (3), 6β-hydroxysitostenone (4), norphytan (5), phytone (6), methyl 3-O-acetylbetulinate (7), 3-O-acetylbetulin (8), sitostenone (9), leucophyllone (10), lupeol (11), lupenone (12), betulinic acid (13), betulinic acid methyl ester (14), and benzyl salicylate (15).
