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Isolated antidiabetic compounds. (a) Salacinol, (b) kotalanol, (c) salaprinol, (d) gallic acid, (e) umbelliferone, (f) ellagic acid, (g) ursolic acid, (h) oleanolic acid, (i) scoparic acid A (j) scutellarein, (k) apigenin, (l) luteolin, (m) coixol, (n) glutinol, and (o) gymnemic acid I: R1 = tigloyl, R2 = acetyl; gymnemic acid II: R1 = 2-methylbutanoyl, R2 = acetyl; gymnemic acid III: R1 = 2-methylbutanoyl, R2 = H; gymnemic acid IV: R1 = tigloyl, R2 = H.
