Studies on the Constituents of Asclepiadaceae Plants. XIX. Components of Metaplexis japonica MAKINO. IV.

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Abstract
The roots of Metaplexis japonica Makino contain a complex glycoside mixture. The alkaline hydrolysate of the crude ester-aglycone mixture showed the presence of sarcostin (I), deacylmetaplexigenin (Ha), deacylcynanchogenin (IVa), utendin (VI), and 3 other new agly cones. The structure of one of these new aglycones, named pergu-larin, was closely related to utendin.

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