| 摘要 |
NEW MATERIAL:A compound shown by the formula (R is H or acyl; n is 1 or 2). EXAMPLE:Dienylposidoyl-(11 10)-dienylposidoyl(11 10)-dienylposidic acid. USE:A raw material and an intermediate for drugs. PREPARATION:Seeds of fruited Eucommia ulmoides this year are ground and extracted with 60vol.% aqueous solution of methanol. The extracted solution is concentrated under reduced pressure, the essence is suspended in water, a water-insoluble part is removed from the suspension, the aqueous solution is chromotographed by column chromatography and successively eluted with water, an aqueous solution of methanol and methanol. |
