2-[4-[[4-[[1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-5-(sulphomethyl)-3-pyridyl]azo]benzoyl]amino]phenyl]-6-methylbenzothiazole-7-sulphonic acid

2-[4-[[4-[[[1-Ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-5-(sulfomethyl)pyridin]-3-yl]azo]benzoyl]amino]phenyl]-6-methyl-7-benzothiazolesulfonic acid