Synonyms: Benzenesulfonic acid, 4-chloro-3-(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);4-Chloro-3-(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, 4-chloro-3-(4,5-dihydro-3-methyl-5-oxo-4-(phenylazo)-1H-pyrazol-1-yl)-, compd. with 2-ethyl-N-(2-ethylhexyl)-1-hexanamine (1:1);4-chloro-3-{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)