Cycloartane glycosides from three species of Astragalus (Fabaceae) - Linnek, J; Mitaine-Offer, A C; Miyamoto, T; Tanaka, C; Paululat, T; Avunduk, S; Alankuş-Çalişkan, Ö; Lacaille-Dubois, M A (Helv Chim Acta, 2011)