Propanoic acid, 2-hydroxy-, compd. with 3,3'-[[6-[[3-(diethylamino)propyl]amino]-1,3,5-triazine-2,4-diyl]bis(imino-4,1-phenylene-2,1-diazenediyl)]bis[5-[[4,6-bis[(2-aminomethylethyl)amino]-1,3,5-triazin-2-yl]amino]-4-hydroxy-2,7-naphthalenedisulfonic acid] (1:1)