Phthaloylhydrazine, 1,4-Ketophthalazine, Phthalodihydrazide, PHTALYLHYDRAZINE, PHTHALIC HYDRAZIDE, PHTHALHYDRAZINE, Phthalhydrizide, 2,3-Dihydro-1,4-phthalazinedione, 2,3-Dihydrophthalazine-1,4-dione, 1,4-phthalazinediol, 2,3-DIHYDRO-PHTHALAZINE-1,4-DIONE, Phthalohydrazide, 1,4-DIHYDROXYPHTHALAZINE, 1,4-Phthalazinedione