Analytical and semipreparative separation of 25 (R/S)-spirostanolsaponin diastereomers using supercritical fluid chromatography - Zhao, Y; McCauley, J; Pang, X; Kang, L P; Yu, H S; Zhang, J; Xiong, C Q; Chen, R; Ma, B P (J Sep Sci, 2013)