2-(o-nitrophenyl)-7-hydroxy-6-nitro-5,8-quinolinedione
2-(o-nitrophenyl)-6-hydroxy-7-nitro-5,8-quinolinedione
2-(o-nitrophenyl)-6,7-dicyano-5,8-dihydroxyquinoline
2-(o-nitrophenyl)-6,7-dicyano-5,8-quinolinedione
2-(o-nitrophenyl)-6-hydroxy-7-cyano-5,8-quinolinedione