2,3,4,5-Tetraphenyl-2,4-cyclopentadienone 2,3,4,5-Tetraphenylcyclopentadienone 2,4-Cyclopentadien-1-one, 2,3,4,5-tetraphenyl- 479-33-4 Cyclone Cyclone (compound) NSC243761 Tetracyclon Tetracyclone Tetraphenyl-2,4-cyclopentadien-1-one Tetraphenylcyclopentadienone