A new erythrodiol triterpene fatty ester from Scorzonera mongolica

Two erythrodiol triterpene fatty esters, 3β-dodecanoyl erythrodiol (1) and 3β-tetradecanoyl erythrodiol (2), were isolated from Scorzonera mongolica.  Their structures were elucidated on the basis of IR, MS and extensive 2D NMR spectroscopic analysis.  Compound 1 was identified to be a new compound and 2 was confirmed to be a new natural compound.  Their antitumor effects in vitro were evaluated with MTT and SRB assays, but compounds 1 and 2 only showed moderate cytotoxicities on A-549 cell line.