1 323 2-[3,6-bis(dimethylamino)xanthen-9-yl]-5-methanoyl-benzoate 1.000 2 FH8 5-carboxy methylrhodamine 0.969 3 ROS N,N'-tetramethyl-rosamine 0.839 4 RHB N-[9-(2-carboxyphenyl)-6-(diethylamino)-3h-xanthen-3-ylidene]-N-ethylethanaminium 0.829 5 RHO Tetramethylrhodamine-5-maleimide 0.763