Disclosed are tricyclic bridged cyclopentanedione derivatives represented by general formula (I). An example of a compound of formula (I) includes (1RS,2SR,6RS,7SR)-4-(3,5-dimethylbiphenyl-4-yl)-5-oxo-10-oxa-tricyclo[5.2.1.02.6]dec-3-en-3-yl-2,2-dimethylpropionate. The compounds are used to control grasses and weeds in crops.