4,5-dimethylcyclohexa-1,4-diene-1,2-dicarboxylic acid

2-[2-(2,6-dimethylphenyl)ethynyl]-1,3-dimethylbenzene

2,3-dibromo-1,4-dithiine-2,3,5,6-tetracarboxylic acid

环己-1,4-二烯-1-羧酸

1,4-环己二烯-1,2-二羧基酸酐