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Two new steroidal glycosides named cyanoauriculoside A(1) and B(2),have been isolated from the roots of Cynanchumauriculatum Royle ex Wight.The structure of cyanoauriculoside A(1) was determined to be 20-O-acetyl-penupogenin-3-O-β-D-glucopyranosyl-(1→4)-β-D-glucopyranosyl-(1→4)-α-L-cymaropyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-α-L-diginopy-ranosyl-(1→4)-β-D-cymaropyranoside.Cyanoauriculoside B(2) was characterized as 20-O-acetylpenupogenin-3-O-β-D-gluco-pyranosyl-(1→4)-α-L-cymaropyranosyl-(1→4)-β-D-cymaropyranosyl-(1→4)-α-L-diginopyranosyl-(1→4)-β-D-cymaropyranoside.The structures of these compounds were elucidated based on the chemical and spectroscopic evidence.
Two new steroidal glycosides named cyanoauriculoside A (1) and B (2), have been isolated from the roots of Cynanchumauriculatum Royle ex Wight. The structure of cyanoauriculoside A (1) was determined to be 20-O-acetyl-penupogenin- O-β-D-glucopyranosyl- (1 → 4) -β-D-glucopyranosyl- (1 → 4) -α-L-cymaropyranosyl- α-L-diginopy-ranosyl- (1 → 4) -β-D-cymaropyranoside. Cyanoauriculoside B (2) was characterized as 20-O-acetylpenupogenin-3-O-β-D-gluco-pyranosyl- ) -α-L-cymaropyranosyl- (1 → 4) -β-D-cymaropyranosyl- (1 → 4) -α-L-diginopyranosyl- (1 → 4) -β-D-cymaropyranoside.The structures of these compounds were elucidated based on the chemical and spectroscopic evidence.