A NEW LIGNANOLIDE FROM THE LEAVES OF DAPHNE GENKWA

A new (-)-4 - oxo - 2, 6 - bis - (3', 4'-methylenedioxy phenyl)-3, 7-dioxabicyclo[3, 3, 0] octane lignan, genkdaphin was isolated from the leaves of Daphne genkwa Sieb. et Zucc. mp 118～119.5℃, C_(20)H_(16)O_7 (HRMS, 368.08631, M~+),[α]_D~(27)-64.8.(c0.5, CHCl_3). On the basis of UV, IR, Ms, ~1H and ~(13)CNMR spectral analysis, the structure of the genkdaphin has been established as (-)-4-oxosesamin.