Isolation of 3-O-(4′-hydroxybenzyl)-beta-sitosterol and 4-[4′-(4″-dihydroxybenzyloxy) benzyloxy] methyl ether from fresh tubers of Gastrodia elata - Yun-Choi,S.H.; Pyo,M.K.; Park,K.M. (Arch Pharm Res, 1998)