1,3-DIPHENYLCYCLOPENTANE-2,4,5-TRIONE

3,5-DIPHENYLCYCLOPENTANE-1,2,4-TRIONE

1,1'-(2,4,5-Trioxocyclopentane-1,3-diyl)dibenzene, 1,3-Diphenyl-2,4,5-trioxocyclopentane