Figure 1.
The structure of ginkgolide (G). GA: R1 = R2 = H, R3 = OH; GB: R1 = R3 = OH, R2 = H; GC: R1 = R2 = R3 = OH; GJ: R1 = H, R2 = R3 = OH; GM: R1 = R2 = OH, R3 = H.
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