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1,7-DIDEOXYGINKGOLIDE C BN-52020 GINKGOLIDE A GINKGOLIDE A, GINKGO BILOBA L PRIMULIC ACID 1 GINKGOLIDE A FROM GINKGO LEAVES (1R,3S,3aS,4R,6aR,7aR,7bR,8S,10aS,11aS)-3-(1,1-Dimethylethyl)hexahydro-4,7b-dihydroxy-8-methyl-9H-1,7a-(epoxymethano)-1H,6aH-cyclopenta[c]furo[2,3-b]furo[3',2':3,4]cyclopenta[1,2-d]furan-5,9,12(4H)-trione BN 5202 9H-1,7a-(Epoxymethano)-1H,6aH-cyclopentacfuro2,3-bfuro3,2:3,4cyclopenta1,2-dfuran-5,9,12(4H)-trione, 3-(1,1-dimethylethyl)hexahydro-4,7b-dihydroxy-8-methyl-, (1R,3S,3aS,4R,6aR,7aR,7bR,8S,10aS,11aS)- ginkgolide a from ginkgo biloba leaves GINKGOBILOBAP.E. 9H-1,7a-(Epoxymethano)-1H,6aH-cyclopenta[c]furo[2,3-b]furo[3',2':3,4]cyclopenta[1,2-d]furan-5,9,12(4H)-trione,3-tert-butylhexahydro-4,7b-dihydroxy-8-