further studies on sesquiterpene lactones and methylated flavones resulted in the isolation of lactones with alpha-methylene gamma-lactone and methylene side chain on the cyclopentyl ring as well as of four methylated flavones ( hispidulin , nepetin , cirsiliol , jaceosidin ) structurally closely related to the cytotoxic flavonoids of other compositae plants .
C0016219
flavones
C0596577
flavonoids