Cytotoxic 24-nor-ursane-type triterpenoids from the twigs of Mostuea hirsuta - Longue Ekon, J P; Bissoue, A N; Fomani, M; Toze, F AA; Waffo Kamdem, A F; Sewald, N; Wansi, J D (Z Naturforsch, 2015)