3-(p-nitrophenyl)-6-methyl-s-triazolo<3,4-a>phthalazine
N-(4-methylphthalazin-1-yl)-p-nitrobenzaldehyde hydrazone
4-methyl-2-(p-nitrobenzyl)-1-phthalazinone
4-methyl-2-(p-toluenesulfonyl)-1-phthalazinone
3-(4'methoxyphenyl)-6-methyl-1,2,4-triazolo<3,4-a>phthalazine