2-Methylphthalazone 4-nitrobenzylidenehydrazone 4-Nitrobenzaldehyde (2-methyl-1(2H)-phthalazinylidine)hydrazone 64765-33-9 BENZALDEHYDE, 4-NITRO-, (2-METHYL-1(2H)-PHTHALAZINYLIDINE)HYDRAZONE Phthalazine, 1,2-dihydro-2-methyl-1-((p-nitrobenzylide)azino)-