Cycloartane glycosides from Astragalus plumosus var. krugianus and evaluation of their antioxidant potential - Denizli, N; Horo, I; Gülcemal, D; Masullo, M; Festa, M; Capasso, A; Koz, Ö; Piacente, S; Alankuş-Çalışkan, Ö (Fitoterapia, 2014)