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In the present study,one new cycloartane triterpenoid,named cycloccidentalic acid C (1) and its glucoside,cycloccidentaliside Ⅵ (2) were isolated from the whole plant of Cassia occidentalis.Their structures were elucidated by a combinational analyses of 1D and 2D NMR data and HRMS.Compound 2 showed modest anti-HIV-1 activity with EC50 value of 1.44 μmol·L-1 and TI (Therapeutic Index) value of 15.59.