1,4-Phthalazinediol 1,4-Phthalazinedione, 2,3-dihydro- 1445-69-8 2,3-Dihydro-1,4-phthalazinedione 2,3-Dihydrophthalazine-1,4-dione AI3-61134 CCRIS 6890 EINECS 215-893-4 N,N'-Phthaloylhydrazine NSC 651 Phthalhydrazide Phthalic acid cyclic hydrazide Phthalocyclohydrazide