4,11-Triphenodioxazinedisulfonic acid, 6,13-dichloro-3,10-bis[[2-[[4-[(2,5-disulfophenyl)amino]-6-[[3-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-1,3,5-triazin-2-yl]amino]ethyl]amino]-, potassium sodium salt (1:?:?)