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Two guaiane-type sesquiterpenoids named orientalol E (1) and orientalol F (3) were isolated from the rhizome of Alisma orientalis (SAM) JUZEP together with two known guaiane-type sesquiterpenoids alismol (2) and alismoxide (4). Their relative stereostructures were elucidated by spectroscopic methods, whereas absolute stereostructures were determined on the basis of chemical correlation.
A new sesquiterpene, named orientanone (1), was isolated from Alisma orientalis Juzep. The structure was elucidated by various spectroscopic methods and X-ray crystallography. Orientanone has a carbon skeleton originating from a guaiane-type carbon skeleton by an isopropyl shift.
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