supplementary material is available for this article at 10.1007/s13659 - 012 - 0038 - 8 and is accessible for authorized users .
 three new triterpenoids , 3-hydroxy - urs-30-p - z - hydroxycinnamoyl-12-en-28-oic - acid ( 1 ) , 3-hydroxy - olean-30-p - ehydroxycinnamoyl-12-en-28-oic - acid ( 2 ) and 3,6-dihydroxy - urs-14-en-12-one ( 3 ) , together with seven known triterpenoids , were isolated from the roots of rubia schumanniana . 
 their structures were established by means of spectroscopic analysis . 
 all compounds were evaluated for cytotoxic activity , and compounds 26 showed cytotoxicity with the ic50 values of 10.7518.87 g / ml . 
 electronic supplementary materialsupplementary material is available for this article at 10.1007/s13659 - 012 - 0038 - 8 and is accessible for authorized users . 
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