2,3-二甲基-1,4-苯醌

2,3,6,7-tetramethyl-2,3,4a,5,8,8a-hexahydronaphthalene-1,4-dione

2,3-二甲基-1,3-丁二烯

邻二甲苯

(+/-)-trans-2,3-dimethylsuccinic anhydride