Phytoecdysones ofRhaponticum integrifolium III. Integristerone B
SummaryFrom the flower heads ofRhaponticum integrifolium we have isolated a new phytoecdysone — integristerone B. It has been shown that it is 1β, 2β, 3β, 5β, 14α, 20R, 22R, 25-octahydroxy-5β-cholest-7-en-6-one.
Phytoecdysones ofRhaponticum integrifolium IV. 24(28)-Dehydromakisterone A
SummaryA new phytoecdysone has been isolated from the flower heads ofRhaponticum integrifolium, and for it the structure of 24(28)-dehydromakisterone A has been established.
5β-Hydroxy-ecdysones and a revision of the structure of ponasterone C
Some of the spectral properties characteristic of the 5β-hydroxy-ecdysones are described and the structure of ponasterone C has been revised to (V); ponasterone B (I) is the only ecdysone having 2α,3α-dihydroxy-groups.