2-hydroxybenzo[c]chromen-6-one

2-cyclohexylcyclohexa-2,5-diene-1,4-dione

3-cyclohexyl-2-(pyridine-2-thiyl)-1,4-benzoquinone

1-hydroxy-8-methoxy-3-methylanthracene-9,10-dione

6-methyl-4a,5,8,8a-tetrahydronaphthalene-1,4-dione