Antitrypanosomal triterpenoid with an ε-lactone E-ring from Salvia urmiensis - Farimani, M M; Nejad Ebrahimi, S; Salehi, P; Bahadori, M B; Sonboli, A; Khavasi, H R; Zimmermann, S; Kaiser, M; Hamburger, M (J Nat Prod, 2013)