1,5-Naphthalenedisulfonic acid, 2-amino-, sodium salt (1:1), diazotized, reaction products with sodium 4-[[4-fluoro-6-[[3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]-5-hydroxy-2,7-naphthalenedisulfonate (1:?)