Obovatol is a biphenyl ether lignan isolated from the leaves of Magnolia obovata Thunb[1].
References
[1] Ito K, et al. Obovatol and obovatal, novel biphenyl ether lignans from the leaves of Magnolia obovata Thunb. Chem Pharm Bull (Tokyo). 1982;30(9):3347-3353. DOI:10.1248/cpb.30.3347