Biflavones and Furanone Glucosides from Zabelia tyaihyonii

Two new biflavones, (aR)-3'-methoxycupressuflavone (1) and (aR)-3',3 "-dimethoxycupressuflavone (2), and two new furanone glucosides, zabeliosides A and B (3 and 4, resp.), along with two known biflavones, cupressuflavone (5) and amentoflavone (6), were isolated from the leaves of Zabelia tyaihyonii. The structures of the new compounds were elucidated by 1D- and 2D-NMR, HR-ESI-MS, and circular dichroism.