Triterpenoids and Diterpenoids from Viburnum chingii

Two new oleanane triterpenoids (1-2) and one new vibsane-type diterpenoid (3), together with 7 known compounds (4-10), were isolated from the leaves of Viburnum chingii. The structures of compounds 1-3 were elucidated by means of spectroscopic methods including extensive 1D- and 2D-NMR technique. Cytotoxicity of compounds 1-10 were tested against HL-60, SMMC-7721, A-549, SK-BR-3, and PANC-1 cell lines. Compound 3 showed significant cytotoxicity against HL-60, SK-BR-3, and PANC-1 cell lines.