ChemInform Abstract: Absolute Structures of Stemona‐Lactam S (I) and Tuberostemospiroline (II), Alkaloids from Stemona tuberosa. Issue 16 (22nd April 2014) - Fukaya, Haruhiko; Hitotsuyanagi, Yukio; Aoyagi, Yutaka; Shu, Zhu; Komatsu, Katsuko; Takeya, Koichi