1,5-Naphthalenedisulfonic acid, 3-2-(acetylamino)-4-4-chloro-6-4-2-(sulfooxy)ethylsulfonylphenylamino-1,3,5-triazin-2-ylaminophenylazo-, trisodium salt

3-[[2-(Acetylamino)-4-[[4-chloro-6-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]phenyl]azo]-1,5-naphthalene disulfonic acid, trisodium salt