嘧啶-5-羧酸

2-chlorofluoren-9-one

5-methyl-4-(5-methylpyrimidin-4-yl)pyrimidine

[5-chloro-2-(5-methylpyrimidin-4-yl)phenyl]-(2-chlorophenyl)methanone

2,2'-Bis(o-chlorobenzoyl)-4,4'-dichlorobiphenyl