7-​[[4-​[Bis(3-​amino-​3-​oxopropyl)​amino]​-​6-​chloro-​1,​3,​5-​triazin-​2-​yl]​amino]​-​4-​hydroxy-​3-​[2-​(4-​methoxyphenyl)​diazenyl]​-2-​naphthalenesulfonic Acid 1-​Methylethyl Ester