Oleanene Glycosides from Crotalaria albida

Two new oleanene glycosides 4 and 7 were isolated by treatment with CH2N2 during a separation procedure from the methanolic extract of Crotalaria albida HEYNE, and their structures were characterized as 3-O-β-D-xylopyranosyl (1→2)-β-D-galactopyranosyl (1→2)-6-O-methyl-β-D-glucuronopyranosyl sophoradiol and 3-O-α-L-rhamnopyranosyl (1→2)[β-D-glucopyranosyl(1→6)]-β-D-galactopyranosyl (1→2)-6-O-methyl-β-D-glucuronopyranosyl soyasapogenol B, respectively. Other compounds 1, 2, 3, 5 and 6 were identified as the uronic acid methyl esters of kaikasaponins I, III and III monomethyl ether, and soyasaponins III and I, respectively.