Synonyms: 3-[[8-[(4,6-Dichloro-1,3,5-triazin-2-yl)amino]-1-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-1,5-naphthalenedisulfonic acid tetrasodium salt;5-(4,6-Dichloro-1,3,5-triazin-2-ylamino)-3-(4,8-disodiosulfo-2-naphtylazo)-4-hydroxy-2,7-naphthalenedisulfonic acid disodium salt