1 RHO Tetramethylrhodamine-5-maleimide 1.000 2 F5M 5-(2,5-dioxo-2,5-dihydro-1h-pyrrol-1-yl)-2-(6-hydroxy-3-oxo-3h-xanthen-9-yl)benzoic acid 0.789 3 323 2-[3,6-bis(dimethylamino)xanthen-9-yl]-5-methanoyl-benzoate 0.763 4 FH8 5-carboxy methylrhodamine 0.744 5 RHB N-[9-(2-carboxyphenyl)-6-(diethylamino)-3h-xanthen-3-ylidene]-N-ethylethanaminium 0.725 6 ROS N,N'-tetramethyl-rosamine 0.722