2-Anthracenesulfonic acid, 1-amino-4-[[3-[[4-chloro-6-[[3-[[[2-(ethenylsulfonyl)ethyl]amino]carbonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]-2,4,6-trimethyl-5-sulfophenyl]amino]-9,10-dihydro-9,10-diox