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- [40] STUDIES ON THE SYNTHESES OF HETEROCYCLIC-COMPOUNDS AND NATURAL-PRODUCTS .999. A NEW SYNTHETIC APPROACH TO QUASSINOIDS VIA AN INTRAMOLECULAR DIELS-ALDER REACTION - A STEREOSELECTIVE CONSTRUCTION OF THE KLAINEANONE RING-SYSTEM JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1, 1983, (10): : 2569 - 2576