Figure 1.

Superimposed representative HPLC chromatograms of compounds 1 and 6–8 at 210 nm and 2–5 at 240 nm: taraxasteryl acetate (1) 33 µg·mL⁻¹; 3β-hydroxy-fern-7-en-6-one acetate (2) 20 µg·mL⁻¹; urs-12-en-11-one-3-acetyl (3) 65 µg·mL⁻¹; 3β-hydroxy-fern-8-en-7-one acetate (4) 31 µg·mL⁻¹; olean-12-en-11-one-3-acetyl (5) 65.5 µg·mL⁻¹; α-amyrin (6) 23 µg·mL⁻¹; lupeol (7) 26 µg·mL⁻¹; lupeol acetate (8) 44 µg·mL⁻¹.