The Structure of Yellow Pigment from the Rhizomes of Cimicifuga dahurica MAXIM.

Abstract

Two yellow pigments were isolated from the rhizomes of Cimicifuga dahurica MAXIM. (Ranunculaceae) and were elucidated as 3-(3'-methyl-2'-butenyliden)-2-indolinone. The two were shown to be geometrical isomer each other and ethanolic solution of one of them gave colorless substance on standing, which was regarded as a product of dimerization.