Triterpene glycosides of Astragalus and their genins. II. The structure of cyclosieversigenin - Svechnikova, A N; Umarova, R U; Gorovits, M B; Seitanudi, K L; Rashkes, Y V; Yagudaev, M R; Abubakirov, N K (Chem Nat Compd, 1981)