Studies on the Constituents of Lespedeza homoloba NAKAI. III. The Structures of Lespein and Lespedezin

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Two new coumaranochromane derivatives named lespein and lespedezin were isolated from the bark of Lespedeza homoloba NAKAI. On the base of the chemical and spectral data, their structures were established as (-) lespein : 6a, 10-diisopentenyl-3, 9-dihydroxy-(6aR, 11aR) pterocarpan and lespedezin : 10-geranyl-3, 9-dihydroxypterocarpan.

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