Synonyms: disodium 4-[4-[[5-[(2-bromo-1-oxoallyl)amino]-2-sulphonatophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-2,5-dichlorobenzenesulphonate;Benzenesulfonic acid, 4-4-5-(2-bromo-1-oxo-2-propenyl)amino-2-sulfophenylazo-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl-2,5-dichloro-, disodium salt;LANASOL4G;benzenesulfonic acid, 4-[4-[[5-[(2-bromo-1-oxo-2-propenyl)amino]-2-sulfophenyl];Itowol Yellow 4GK;Wool Reactive Yellow PW-4G;4-[[4-[5-(2-Bromo-1-oxo-2-propenylamino)-2-(sodiosulfo)phenylazo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol]-1-yl]-2,5-dichlorobenzenesulfonic acid sodium salt;4-[4-[[5-[(2-Bromo-1-oxo-2-propenyl)amino]-2-sulfophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazole-1-yl]-2,5-dichlorobenzenesulfonic acid disodium salt