5-Carboxyrhodamine 6G maleimide

5-CR6G maleimide is a thiol-reactive derivative of rhodamine 6G. It is preferred choice (than the mixed isomers) for some complicated biological applications where reproducibility is more critical than material cost since the minor positional difference between 5-CR6G and 6-CR6G might significantly affect some biological properties of the underlying conjugates. Rhodamine 6G is one of the brightest rhodamine dyes, but most of the rhodamine 6G dyes have much lower solubility than other rhodamine dyes. For similar or equivalent spectral properties, iFluor dyes have much better water solubilities.