1,1'-(1,4-Phenylenebiscarbonyl)bis(azacycloheptane-2-one)

1,1'-(p-phenylenedicarbonyl)bis[hexahydro-2H-azepin-2-one]

1,1'-(1,4-Phenylenedicarbonyl)bis(hexahydro-1H-azepin-2-one)

1,1'-(1,4-Phenylenedicarbonyl)bis(1,3,4,5,6,7-hexahydro-2H-azepin-2-one)