3-[2-Acetylamino-4-[4-chloro-6-(2-sulfoethylamino)-1,3,5-triazin-2-ylamino]phenylazo]-1,5-naphthalenedisulfonic acid trisodium salt

trisodium 3-[[2-(acetylamino)-4-[[4-chloro-6-[(2-sulphonatoethyl)amino]-1,3,5-triazin-2-yl]amino]phenyl]azo]naphthalene-1,5-disulphonate