Abstract
Five new glycosides were isolated from the Chinese crude drug ‘Tong-guang-san’: the stems of Marsdenia tenacissima (Roth.) Wight et Arn. (Asclepiadaceae). The structures of tenacissosides A-E were deduced on the basis of chemical and spectral evidence as tenacigenin B-I 3- O-β- D-glucopyranosyl-(1→4)-3- O-methyl-6-deoxy-β- D- allopyranosyl-(1→4)-β- D-oleandropyranoside, tenacigenin B-II 3- O-β- D-glucopyranosyl-(1 →4)-3- O-methyl-6-deoxy- β- Dallopyranosyl-(1 →4)-β- D-oleandropyranoside, tenacigenin B-III 3- O-β- Dglucopyranosyl-(1→4)-3- O-methyl-6- deoxy-β- D-allopyranosyl-(1 → 4)-β- D-oleandropyranoside, tenacigenin B-IV 3- O-β- D-glucopyranosyl-(1 →4)-3- O- methyl-6-deoxy-β- D-allopyranosyl-(1 → 4)-β- D-oleandropyranoside and tenacigenin B-V 3- O-β- D-glucopyranosyl- (1 → 4)-3- O-methyl-6-deoxy-allopyranosyl-(1 → 4)-β- D-oleandropyranoside, respectively.
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