The structures of yellow pigments from the rhizomes of Cimicifuga dahurica Maxim.

Chemical and Pharmaceutical Bulletin
1981.0

Abstract

Two yellow pigments, I and II were isolated from the rhizomes of Cimicifuga dahurica MAXIM. (Ranunculaceae) and were elucidated as geometric isomers, $(E)$ -3-(3'-methyl-2'butenylidene)-2-indolinone and $(Z)$ -3-(3'-methyl-2'-butenylidene)-2-indolinone, by chemical and spectral studies and by X-ray diffraction analysis, respectively. On standing, an ethanolic solution of II gave a colorless substance, which was regarded as a product of dimerization.

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