Nihei Ken-ichi, Asaka Yukihiro, Mine Yoshihiro, Kubo Isao
Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-31122, USA.
J Nat Prod. 2005 Feb;68(2):244-7. doi: 10.1021/np049697i.
Three new A-seco limonoids, zumketol (1), zumsenin (2), and zumsenol (3), were isolated from a methanol extract of Croton jatrophoides by bioassay-guided fractionation, and their structures were determined by NMR analysis. The alpha-ketol 1 may be biosynthesized via the intramolecular acyloin condensation of a dicarboxylate intermediate.
