Synonyms: Benzenesulfonic acid, 2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-4-(2-phenyldiazenyl)-1H-pyrazol-1-yl)-, compd. with 2-ethyl-N-(2-ethylhexyl)-1-hexanamine (1:1);Benzenesulfonic acid, 2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)-, di(2-ethylhexyl)amine salt;2,5-Dichloro-4-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)benzenesulphonic acid, compound with bis(2-ethylhexyl)amine(1:1);Benzenesulfonic acid, 2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)-, compd. with 2-ethyl-N-(2-ethylhexyl)-1-hexanamine (1:1);2,5-dichloro-4-{3-methyl-5-oxo-4-[(E)-phenyldiazenyl]-4,5-dihydro-1H-pyrazol-1-yl}benzenesulfonic acid - 2-ethyl-N-(2-ethylhexyl)hexan-1-amine (1:1)