4,5,6,11-tetrahydro-6,11-dioxoanthra(2,1-b)thiophene

N-benzoyl-2-aza-1,2,3,4-tetrahydrobenz[a]anthracene-7,12-dione

6,11-dihydro-1-methyl-6,11-dioxoanthra[2,1-b]thiophene

4,5,6,11-tetrahydro-1-methyl-6,11-dioxoanthra[2,1-b]thiophene

1,2,3,4,5,6,7,8-octahydro-benzo[b]triphenylene-9,14-dione