Urea, 1,1-diphenyl-

芴

2,2-diphenylcyclobutan-1-one

1,1',1'',1'''-(2,5-环己二烯-1,4-二亚基二亚甲二基)四苯

1,3,3-triphenyl-4-(2-phenylethenyl)azetidin-2-one