3-(1H-indol-3-yl)-1-methylquinoxalin-2-one

N-(2,5-dioxocyclohexa-1,4-dienyl)morpholine

dimethyl 9,10-anthraquinone-1,5-dicarboxylate

methyl 1,4-naphthoquinone-5-carboxylate

4-[bis(diphenylphosphoryl)methyl]-4-hydroxycyclohexa-2,5-dien-1-one