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- [28] SESQUITERPENOIDS .20. X-RAY CRYSTALLOGRAPHIC DETERMINATION OF MOLECULAR-STRUCTURE OF BERLANDIN, A GUAIANOLIDE EPOXIDE - COMMENTS ON CIRCULAR-DICHROISM OF SESQUITERPENOID ALPHA-METHYLENE GAMMA-LACTONES WITH ALPHA,BETA-UNSATURATED ESTER SIDE-CHAINS JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2, 1975, (05): : 459 - 463