Figure 1.
(A) The structure of betulinic acid (BA). (B) The structure of mannosylerythritol lipids (MELs). MEL-A: R1 = R2 = Ac; MEL-B: R1 = Ac, R2 = H; MEL-C: R1 = H, R2 = Ac, n = 6–10; MEL-D: R1 = R2 = H, n = 4–14.
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