methyl rac-2-acetoxy-1,2,3,4,5,8-hexahydro-5,8-dioxonaphthalene-2-carboxylate

methyl 2-acetoxy-1,2,3,4-tetrahydro-5,8-dimethoxynaphthalene-2-carboxylate

6-carbomethoxy-1,4-dimethoxynaphthalene

methyl 6,11-bis(chlorooxy)-12-oxo-7,9,10,12-tetrahydro-8H-benzo[b]xanthene-8-carboxylate

6-methoxycarbonyl-1,4-naphthoquinone