Chemical profiling of the cytotoxic triterpenoid-concentrating fraction and characterization of ergostane stereo-isomer ingredients from Antrodia camphorate - Du, Y C; Wu, T Y; Chang, F R; Lin, W Y; Hsu, Y M; Cheng, F T; Lu, C Y; Yen, M H; Tsui, Y T; Chen, H L; Hou, M F; Lu, M C; Wu, Y C (J Pharm Biomed Anal, 2012)