2-((3-Ethyl-5-((3-ethyl-4,5-diphenyl-(3H)-thiazol-2-ylidene)ethylidene)-4-oxothiazolidin-2-ylidene)methyl)-4-methyl-1-(4-sulphonatobutyl)pyrimido(1,2-a)benzimidazolium 68758-82-7 EINECS 272-158-0 Pyrimido(1,2-a)benzimidazolium, 2-((3-ethyl-5-((3-ethyl-4,5-diphenyl-2(3H)-thiazolylidene)ethylidene)-4-oxo-2-thiazolidinylidene)methyl)-4-methyl-1-(4-sulfobutyl)-, inner salt