1 Lignans and aporphine alkaloids in bark of Liriodendron tulipifera Phytochemistry, Volume 17, Issue 4, 1978, Pages 779-782 Chen Chen-Loung, Chang Hou-Min http://www.sciencedirect.com/science/article/pii/S0031942200942262 2 Formation of liriodendritol in Liriodendron tulipifera Phytochemistry, Volume 27, Issue 3, 1988, Pages 773-774 Peter Dittrich, Norbert Schilling http://www.sciencedirect.com/science/article/pii/0031942288840913 3 Geographic variation in the essential oil monoterpenes of Liriodendron tulipifera L Biochemical Systematics and Ecology, Volume 16, Issues 7-8, 14 December 1988, Pages 627-630 Andrew L. Smith, Charles L. Campbell, Douglas B. Walker, James W. Hanover, Raymond O. Miller http://www.sciencedirect.com/science/article/pii/0305197888900750 4 2-C-methyl-d-erythritol in leaves of Liriodendron tulipifera Phytochemistry Volume 27, Issue 3, 1988, Pages 935 Peter Dittrich, Stephen J. Angyala http://www.sciencedirect.com/science/article/pii/0031942288841256 5 (+)- and (-)-liriodenol, a pair of novel enantiomeric lignans from Liriodendron hybrid Bioorganic & Medicinal Chemistry Letters Volume 25, Issue 9, 1 May 2015, Pages 1976-1978 Dong-Ting Yanga, d, ↑, Sen-Sen Linb, ↑, Jin-Hui Chenc, ↑, Sheng-Tao Yuanb, Ji-Sen Shic, , , Jun-Song Wanga, Ai-Qun Jiaa, , http://www.sciencedirect.com/science/article/pii/S0960894X15002115 谢谢~