From the roots, stems and fruits of Simarouba versicolor (Simaroubaceae) were isolated quassinoids (3, 5-7), triterpenoids (8-14), a mixture of steroids (15-17), the flavonoid kaempferol (18) and the squalene derivative
A detailed NMR study and full assignments of the 1 H and 13 C spectral data for two novel triterpenoid saponins isolated from the stem bark of Pentaclethra macroloba (Willd.) Kuntze are described. Their structures were established using a combination of 1D and 2D NMR techniques including 1
H, 1 H-COSY, TOCSY, NOESY, gs-HMQC and gs-HMBC, and also electrospray ionization mass spectrometry and chemical methods. The structures were established as 3b-O-f[O-b-D-glucopyranosyl-(1→2)-O-b-D-glucopyranosyl-(1→4)-O-b-D-glucopyranosyl-(1→3)-O-a-Lrhamnopyranosyl-(1→2)]-[O-b-D-glucopyranosyl-(1→3)-O-b-D-glucopyranosyl-(1→4)]g-a-L-arabinopyranosylhederagenin (1) and 3b-O-f[O-b-D-glucopyranosyl-(1→2)-O-b-D-glucopyranosyl-(1→4)-O-b-D-glucopyranosyl-(1→3)-O-a-L-rhamnopyranosyl-(1→2)]-[O-b-D-glucopyranosyl-(1→3)-O-b-D-glucopyranosyl-(1→4)]g-a-L-arabinopyranosyloleanolic acid (2).
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