Antituberculosis cycloartane triterpenoids from Radermachera boniana.
Truong NB, Pham CV, Doan HT, Nguyen HV, Nguyen CM, Nguyen HT, Zhang HJ, Fong HH, Franzblau SG, Soejarto DD, Chau MV.
Three new triterpenoids, bonianic acids A (1) and B (2) and 3-O-acetyluncaric acid (3), were isolated from the leaves and twigs of Radermachera boniana, together with six known compounds, ursolic acid (4), oleanolic acid (5), 3-epi-oleanolic acid (6), 3α-O-acetyl-α-boswellic acid (7), ergosterol peroxide (8), and β-sitostenone (9). Ergosterol peroxide (8) and bonianic acids A (1) and B (2) exhibited significant activity against Mycobacterium tuberculosis H37Rv strain.