4-Chloro-5-(1-methylhydrazino)-2-phenyl-3(2H)-pyridazinone

4-CHLORO-5-(1-METHYLHYDRAZINO)-2-PHENYLPYRIDAZIN-3(2H)-ONE

4-CHLORO-5-(1-METHYLHYDRAZINO)-2-PHENYL-2,3-DIHYDROPYRIDAZIN-3-ONE