2,3-dimethyl-5-(4-methylphenylthio)cyclohexa-2,5-diene-1,4-dione

2,3-dimethyl-5-phenylsulfonyl-1,4-benzoquinone

2,3-二甲基马来酸酐

顺丁烯二酸

5-bromo-2,3-dimethylcyclohexa-2,5-diene-1,4-dione