Ursane-Type Triterpenes with a Phenylpropanoid Unit from Camellia ptilosperma and Evaluation of Their Cytotoxic Activities

Six new ursane-type triterpenes with a phenylpropanoid unit and five known oleanane-type triterpenes were isolated from the leaves of Camellia ptilosperma. The undescribed compounds were identified by analysis of 1D and 2D NMR and HRESIMS spectroscopic data as ptilospermanols A–F. The cytotoxicity of new compounds against six human cancer cell lines and three mouse tumor cell lines was evaluated by MTT assay.