11,11-dibromo-1,4,9,10-tetrahydro-4a,9a-methanoanthracene

1,4,9,10-tetrahydroanthracene

5-diazo-10,11-dihydro-5H-Dibenzo[A,D]cycloheptene

1,2,3,4,9,10-hexahydro-4a,9,9a-methenoanthracene

11,11-dibromo-1,2,3,4,9,10-hexahydro-4a,9a-methanoanthracene