Saikosaponins from Aerial parts

The extraction and isolation steps of saikosaponins from aerial parts of B. rigidum are shown in Scheme 1. 

From the roots of B. rigidum five new saponins have been isolated and identihed, of which three were saikosaponins, two related to saikogenin F and one to saikogenin D. One of them was also foimd in the aerial parts. Two saponins were related to oleanolic acid. Trivial names of sandrosaponins VII-X wrae given to them. 

Sandrosaponin I (1), the major saikosaponin isolated from the aerial parts of B. rigidum, contained a saikogenin F moiety, first described by Kubata... 

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