Abstract
Four new carbohydrates were isolated from the acidic hydrolysis part of the ethyl acetate extract of Cynanchum otophyllum Schneid (Asclepiadaceae). Their structures were determined as methyl 2,6-dideoxy-3- O-methyl-β- d- arabino-hexopyranosyl-(1 → 4)-6-deoxy-3- O-methyl-β- d -ribo-hexopyranosyl-(1 → 4)-6-deoxy-3- O-methyl-α- l- ribo-hexopyranoside ( 1), methyl 6-deoxy-1,3-di- O-methyl-β- d- ribo-hexosyl-(1 → 4)-2,6-dideoxy-3- O-methyl-α- d- arabino-hexopyranoside ( 2), methyl 2,6-dideoxy-3- O-methyl-β- d- arabino-hexopyranosyl-(1 → 4)-6-deoxy-3- O-methyl-α- l- ribo-hexopyranoside ( 3), and 2,6-dideoxy-3- O-methyl-β- d- arabino-hexopyranosyl-(1 → 4)-2,6-dideoxy-3- O-methyl-α- d -arabino-hexopyranosyl-(1 → 4)-2,6-dideoxy-3- O-methyl-β- d- lyxo-hexopyranose ( 4), respectively, by spectral methods.
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