Pyrimido[1,2-a]benzimidazolium, 2-[[3-ethyl-5-[2-(3-ethyl-4,5-diphenyl-2(3H)-thiazolylidene)ethylidene]-4-oxo-2-thiazolidinylidene]methyl]-4-methyl-1-(4-sulfobutyl)-, inner salt
Pyrimido[1,2-a]benzimidazolium, 2-[[3-ethyl-5-[2-(3-ethyl-4,5-diphenyl-2(3H)-thiazolylidene)ethylidene]-4-oxo-2-thiazolidinylidene]methyl]-4-methyl-1-(4-sulfobutyl)-, inner salt