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 56195-73-4 AI3-22092 Cyclone EINECS 207-530-3 NSC 2060 Tetracyclon Tetracyclone Tetraphenyl-2,4-cyclopentadien-1-one Tetraphenylcyclopentadienone