3,3'-Bis(4-sulfobutyl)-5,5'-diphenyl-9-ethyloxacarbocyanine betaine sodium salt

5-Phenyl-2-[2-[[5-phenyl-3-(4-sulfobutyl)-3H-benzoxazol-2-ylidene]-methyl]-but-1-enyl]-3-(4-sulfobutyl)-benzoxazolium hydroxide, inner salt, sodium salt, a fluorescent dye employed in the realm of biomedical investigation to probe intricate protein-protein interactivities and enrich scientific comprehension of cellular imaging. This singular compound further finds application in the realm of fluorescence microscopy, facilitating enhanced visualization of intricate biological architectures and functional components within diverse biological specimens.