1H-4,6-[1]Propen[3]ylidenecyclohepta[c]pyran-1,3(5H)-dione (9CI); Bicyclo[4.4.1]undeca-1,3,5,7,9-pentaene-2,10-dicarboxylicanhydride (7CI); Bicyclo[4.4.1]undecane-2,10-dicarboxylicanhydride (8CI)
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