Quantitative Determination of Ophiopogonin D by Liquid Chromatography/Electrospray Ionization Mass Spectrometry and its Pharmacokinetics in Rat - Xia, Chun-hua; Sun, Jian-guo; Hao, Hai-ping; Wang, Guang-ji; Yan, Bei; Gu, Sheng-hua; Zheng, Chao-nan; Shang, Li-li; Roberts, Michael S (Planta Medica, 2008)