Jacaranone and related compounds from the fresh fruits of Ternstroemia japonica and their antioxidative activity.

Jacaranone and related compounds (1–3) were isolated, along with three triterpenes (4–6), from the fresh fruits ofTernstroemia japonica. The compounds were identified as jacaranone (1), 3-hydroxy-2,3-dihydrojacaranone (2), 3-methoxy-2,3-dihydrojacaranone (3), 3-O-acetyloleanolic acid (4), 3-O-acetylursolic acid (5), and ursolic acid (6). Jacaranone and its derivatives were isolated for the first time from Theaceae. Of the isolated compounds, compound3 is a new compound. Jacaranone (1) exhibited weak antioxidative effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical.