tetrasodium 2-[4-[[4-[2-(4-nitro-2-sulphonatophenyl)vinyl]-3-sulphonatophenyl]azo]phenyl]naphtho[1,2-d]triazole-6,8-disulphonate

2H-Naphtho[1,2-d]triazole-6,8-disulfonic acid, 2-[4-[[4-[2-(4-nitro-2-sulfophenyl) ethenyl]-3-sulfophenyl]azo]phenyl]-, tetrasodium salt

2-[4-[[4-[2-[4-Nitro-2-[(sodiooxy)sulfonyl]phenyl]ethenyl]-3-[(sodiooxy)sulfonyl]phenyl]azo]phenyl]-2H-naphtho[1,2-d]triazole-6,8-disulfonic acid disodium salt