supplementary material is available for this article at 10.1007/s13659 - 011 - 0031 - 7 and is accessible for authorized users .
 three new ent - kauranoids , isorosthornins a - c ( 13 ) , and a new natural product , dihydroponicidin ( 4 ) , together with five known ones were isolated from the aerial parts of isodon rosthornii . 
 the structures were determined by means of extensive spectroscopic analysis . all diterpenoids isolated were evaluated for their cytotoxicity against hl-60 , smmc-7721 , a-549 , mcf-7 , and sw480 cell lines , and compounds 5 and 7 showed significant inhibitory effects on all cell lines . 
 electronic supplementary materialsupplementary material is available for this article at 10.1007/s13659 - 011 - 0031 - 7 and is accessible for authorized users . 
Electronic Supplementary Material
Electronic supplementary material