Dehydro- 3-peltatin methyl ether

The methyl ether (23) was compared with analogous known lignans. The H-NMR spectra of compound (2 3) differed from that of dehydro- / -peltatin methyl ether (24) which has the methoxy group at the C-8 position (ref. 25) and from that of dehydrohernandin (25) which has the methoxy group at the C-5 position (ref. 

---