Two New Flavonoids from Andrographis rothii

Abstract

Two new flavonoids, 5, 7, 2′, 5′-tetramethoxyflavanone (1) and 5-hydroxy-7, 2′-dimethoxyflavone (2), together with two known flavones, skullcapflavone I (3) and echioidin (4) were isolated from the whole plant of Andrographis rothii. The structures of the new compounds were established by extensive one- and two-dimensional (1D- and 2D-) NMR spectral studies.