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