2-Methyl-4-chlorophthalazone 4-nitrobenzylidenehydrazone 4-Nitrobenzaldehyde (4-chloro-2-methyl-1(2H)-phthalazinylidene)hydrazone 67458-35-9 BENZALDEHYDE, 4-NITRO-, (4-CHLORO-2-METHYL-1(2H)-PHTHALAZINYLIDENE)HYDRAZONE BRN 0898410