Also Called: Benzenesulfonic acid, 2,5-dichloro-4-[[2-(dibutylamino) -4-methyl-6-[[2-(4-sulfophenyl)ethyl]amino ]-5-pyrimidinyl]azo]-, sodium salt;Benzenesulfonic acid, 2,5-dichloro-4-[2-[2-(dibutylamino)-4-methyl-6-[[2-(4-sulfophenyl)ethyl]amino]-5-pyrimidinyl]diazenyl]-, sodium salt (1:?);Benzenesulfonic acid, 2,5-dichloro-4-[[2-(dibutylamino)-4-methyl-6-[[2-(4-sulfophenyl)ethyl]amino]-5-pyrimidinyl]azo]-, sodium salt;2,5-dichloro-4-[[2-(dibutylamino)-4-methyl-6-[[2-(4-sulphophenyl)ethyl]amino]-5-pyrimidinyl]azo]benzenesulphonic acid, sodium salt