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Two novel noroleanane saponins, tubeimoside A ( 1) and tubeimoside B ( 2), and a new dammarane triterpene saponin, tubeimoside C ( 3), together with two known compounds, 4 and 5, were isolated from the bulbs of Bolbostemma paniculatum ( Maxim.) Franquet. Compound 4 was found in this genus for the first time. Based on spectroscopic methods, including IR, NMR (DEPT, COSY, HMQC, HMBC, and TOCSY), and MS experiments, and chemical reactions, the structures of the new compounds were elucidated as 3 β-[ β- D-glucopyranosyl-(1→2)- β- D-glucopyranosyloxy]-2 β,23-dihydroxy-28-norolean-12-en-16-one ( 1), 3 β-[ β- D-glucopyranosyl-(1→2)- β- D-glucopyranosyloxy]-2 β,23-dihydroxy-28-norolean-12-en-22-one ( 2), (3 β,7 β)-7,18,20-trihydroxydammar-24-en-3-yl 2- O- α- L-arabinopyranosyl- β- D-glucopyranoside ( 3). [ABSTRACT FROM AUTHOR]

The antibacterial activities of compounds (I) and (II) are evaluated, and (I) is shown to exhibit moderate activity. [ABSTRACT FROM AUTHOR]

Isolation and structure determination of five novel triterpenes, gypensapogenins H (Ia), I (Ib), L (II), J (III), and K (IV) are reported. [ABSTRACT FROM AUTHOR]

isolation and structure determination of two novel noroleanane saponins, tubeimoside A (I) and regioisomeric tubeisomide B, and a new dammarane triterpene saponin, tubeimoside C (II), together with two known compounds [ABSTRACT FROM AUTHOR]