1,4-Phthalazinedione, 2,3-dihydro-2-(3-chlorophenyl)-, 4-hydrazone 2,3-Dihydro-2-(4-chlorophenyl)-1,4-phthalazinedione 4-hydrazone 2-(4-Chlorofenylo)-4-hydrazynoftalazynon-1 [Polish] 5-24-07-00565 (Beilstein Handbook Reference) 68763-98-4 BRN 0818638