TY - JOUR AU - Nsiama, T K; Okamura, H; Hamada, T; Morimoto, Y; Doe, M; Iwagawa, T; Nakatani, M TI - Rings D-seco and B,D-seco tetranortriterpenoids from root bark of Entandrophragma angolense JO - Phytochemistry VL - 72 PY - 2011 DO - 10.1016/j.phytochem.2011.05.014 SP - 1854 EP - 1858 ER -