A new triterpenoid saponin, named segetosideC(1), and two known saponins, vaccaroidA(vaccarosideA) (2) and dianosideG(3), have been isolated from the seeds ofVaccaria segetalis. On the basis of chemical reaction and spectral data, the structure of segetosideC(1) has been established as: gypsogenic acid-28-O-#x3B2;-D-glucopyranosyl-(1 #x2192; 3)-6-O-acetyl-#x3B2;-D-glucopyranosyl-(1 #x2192; 2)-#x3B2;-D-glucopyranosyl-(1 #x2192; 6)-#x3B2;-D-glucopyranoside.
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