1,5,5,6-四甲基环己-1,3-二烯

丁炔二酸二甲酯

dimethyl 1,3-dimethyl-3-hydroxy-2-oxobicyclo[2,2,2]octa-5,6-diene-dicarboxylate

2-diazonio-1-methoxyethenolate

间二甲苯