4-piperidino-1(2H)-phthalazinone

4-morpholino-1(2H)-phthalazinone

4-(2,6-dimethylmorpholino)-1(2H)-phthalazinone

4-hexamethyleneimino-1(2H)-phthalazinone

4-heptamethyleneimino-1(2H)-phthalazinone