1,4-Dihydrazinonaphthalazine 1,4-Dihydrazinophthalazine 1,4-Phthalazinedione, 2,3-dihydro-, dihydrazone 484-23-1 C 7441 Cassella 532 Dihydralazin Dihydralazine Dihydrallazin Dihydrallazine Dihydrazinophthalazine Hypopresol NSC526654 Nepresol Nepresolin Nepressol Ophthazin Phthalazine, 1,4-dihydrazino- Tonolysin