Abstract
Seven new triterpenoid saponins were isolated from the seeds of Amaranthus caudatus (Amaranthaceae). Their structures were elucidated on the basis of spectral and chemical data to be (1) 3-β-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl-2β,3β-dihydroxyolean-12-en-28-oic acid 28-O-β-D-glucopyranosyl ester, (2) 3-α-O-α-L-rhamnopyranosyl-(1→2)-6-O-methyl-β-D-glucopyranosyl-2β,3β-dihydroxyolean-12-en-28-oic acid 28-O-β-D-glucopyranosyl ester; (3) 3-β-O-α-L-rhamnopyranosyl(1→2)-β-D-glucopyranosyl-2β,3β-dihydroxy-23-oxoolean- 12-en-28-oic acid 28-O-β-D-glucopyranosyl ester; (4) 3-β-O-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl-2β,3β,6α-trihydroxy-23-oxoolean12-en-28-oic acid 28-O-β-D-glucopyranosyl ester; (5) 2β,3β-dihydroxy-30-norolean-12,20(29)-diene-23,28-dioic acid 28-O-β-D-glucopyranosyl ester; (6) 2β,3β-dihydroxy-30-norolean-12,20(29)-diene-23,28-dioic acid 23,28-di-O-β-D-glucopyranosyl ester, (7) 3-O-β-D-glucopyranosyl-2β,3β-dihydroxy-30-norolean-12,20(29)-diene-23,28-dioic acid 23,28-di-O-β-D-glucopyranosyl ester
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