2,7-Naphthalenedisulfonicacid,4-hydroxy-5-[2-[4-[[4-[(2-hydroxyethyl)amino]-6-[[5-hydroxy-6-[2-(2-methoxy-5-sulfophenyl)diazenyl]-7-sulfo-2-naphthalenyl]amino]-1,3,5-triazin-2-yl]amino]-5-methoxy-2-me