Two new C steroids periplosteroid A-B () and seven known C steroids (-) were isolated from the stems and roots of , among them, compounds , , and were firstly isolated from this plant. The structures of periplosteroid A-B were identified by comprehensive spectroscopic analyses, including 1D-NMR, 2D-NMR, HR-ESI-MS, UV, and IR spectral data. The results of cytotoxic activity showed that all the isolates exhibited certain inhibitory activity on six kinds of human tumour cell lines (786-O, MKN-45, 5637, L-02, MCF7 and 293 T).
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