New Spirorotenoids from Tephrosia candida

The ethyl acetate extract of roots of  Tephrosia candida afforded three new spirorotenoids belonging to a new class of spirocompounds, named tephrospirolactone, tephrospiroketone I,  and  tephrospiroketone  II.  The  structures  of  these  compounds  were  determined  mainly based on spectral analysis. The only known spirorotenoid described in the literature is amor-phispironone, isolated from  Amorpha fruticosa.