Abstract
Abstract By virtue of the soil bacterial hydrolysis method, a mixture ( ca 12:1) of prosapogenols has been isolated, and on the basis of chemical and physicochemical evidence, the structure of major component (designated as NE-1A) has been established as 2β - acetoxy - 3α - hydroxy - 11α- (tri -O- acetyl - α - L - arabinopyranosyl)oxy - 5β, 25R - spirostane ( 10 ), and the minor presumed as its 3-epimer ( 11 ). NE-1A ( 10 ) is characteristic of possessing a fully acetylated arabinoside linkage at C-11 of a new steroidal aglycone 3-epi-metagenin ( 9 ), which is a ninth spirostanol isolated from the titled plant. Finally, NE-1A ( 10 ) has been subjected to detailed PMR examinations including homonuclear INDOR, double and triple resonance experiments, and the prominent signals have been assigned.
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