Sikokianin D, A New C-3/C-3'-Biflavanone from the Roots of Wikstroemia indica

A new 3,3''-biflavanone, sikokianin D (1), was isolated from the roots of Wikstroemia indica, together with two known compounds. Their structures were elucidated by chemical evidence and spectral analyses, including HR-ESI-MS, and 1D- and 2D-NMR techniques.