1H-Benzimidazole-1-butanesulfonic acid, 5,6-dichloro-2-((1,3-diethyltetrahydro-4,6-dioxo-2-thioxo-5(2H)-pyrimidinylidene)ethylidene)-3-ethyl-2,3-dihydro- 5-(2-(5,6-Dichloro-1-ethyl-3-(4-sulfobutyl)-2-benzimidazolinylidene)ethylidene)-1,3-diethyl-2-thiobarbituric acid 71130-53-5