1,2,3,4-Tetraphenyl-1,3-cyclopentadiene 1,2,3,4-Tetraphenylcyclopentadiene 1,3-Cyclopentadiene, 1,2,3,4-tetraphenyl- 15570-45-3 Benzene, 1,1',1'',1'''-(1,3-cyclopentadiene-1,2,3,4-tetrayl)tetrakis- NSC72113