(7-acetyloxy-5,8-dioxonaphthalen-1-yl) acetate

methyl 2-acetyloxy-5-nitrobenzoate

(3,5-dibromo-1-methyl-4-oxocyclohexa-2,5-dien-1-yl) acetate

(3,5-dichloro-1-methyl-4-oxocyclohexa-2,5-dien-1-yl) acetate

(3,5-dibromo-1-ethyl-4-oxocyclohexa-2,5-dien-1-yl) acetate