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Eight new compounds, including four rare B-seco-29-nor-limonoids, toonaciliatones A-D (1–4), and four normal B-seco-limonoids, toonaciliatones E-H (5–8), together with six known compounds (9–14), were isolated from the stem barks of Toona ciliata var. yunnanensis. Toonaciliatones A and B (1–2) are the first examples of B-seco-29-nor-limonoids without the common five-membered 4, 7-lactone. Their structures...
The orthoester, a functional group that features three alkoxy groups attaching to a single carbon atom, was an important structural subunit discovered in plant resource. Diverse phragmalin-type limonoids with different orthoester moiety and connected locations have been isolated from the Meliaceae family. Under the guidance of plausible biosynthetic pathway, phragmalin-type 1/8/9-orthoesters were...
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