Flavone Glycosides from Strobilanthes Formosanus

Two new flavone glycosides, 3′‐hydroxy‐5,7‐dimethoxyflavone 4′‐O‐β‐D‐apiofuranoside (1), and 5,7‐dimethoxyflavone 4′‐O‐[β‐D‐apiofuranosyl(1→5)‐ β‐D‐glucopyranoside] (2) along with four known compounds, 4′‐hydroxy‐5,7‐dimethoxyflavone (3), 2,6‐dimethoxy‐1,4‐benzoquinone (4), lupeol (5) and betulin (6) were isolated from the stem and roots of Strobilanthes formosanus. Their structures were elucidated on the basis of their spectroscopic evidence.