Title: Singh SB, et, al. Spirostanol saponins from Paris polyphylla, structures of polyphyllin C, D, E and F. Phytochemistry.1980; 21(12): 2925-2929.
Title: Man S, et, al. Characterization of steroidal saponins in saponin extract from Paris polyphylla by liquid chromatography tandem multi-stage mass spectrometry. Anal Bioanal Chem. 2009 Sep;395(2):495-505.