Synonyms: 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)-,hydroxide, inner salt; 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 (9CI)