Synonyms: 3H-Pyrazol-3-one,4,4'-(3-acetyl-1,5-formazandiyl)bis[1,2-dihydro-1,5-dimethyl-2-phenyl-, (Z,E)-;1-(4-Antipyrinylazo)-1-(4-antipyrinylhydrazino)propan-2-one; 3H-Pyrazol-3-one,4-[[1-[(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)azo]-2-oxopropylidene]hydrazino]-1,2-dihydro-1,5-dimethyl-2-phenyl-,(Z,E)-; Azonol A 1