<unk> , or<unk>  is an analgesic. It is formed by reducing diortho-dinitrodiphenyl with sodium amalgam and methyl alcohol, or by heating diphenylene-ortho-dihydrazine with hydrochloric acid to 150 C. It crystallizes in needles which melt at 156 C. Potassium permanganate oxidizes it to pyridazine tetracarboxylic acid.
Phenazone
Fluorometholone
Quinolone
Naloxazone
Flosequinan
Chlorzoxazone
Methicillin
Enoxolone