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GINKGOLIDE A is one of the bitter principles1 from and the X-ray analysis of a mono-p-bromo-Gingko biloba L., which is a gymnospermous tree and a single surviving species of the family Ginkgo-The aqueous extracts of the leaves were treated nceae, comprising Mesozoic plants. I n this Comwith charcoal, which absorbed bitter principles niuiiication we report the isolation of the three effectively. The collected charcoal was washed diterpenoids, their chemical and physical properties u-ith hot acetone. Concentration of the acetone benzoate of ginkgolicle L \ .

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