5(6)-Carboxyfluorescein N-hydroxy-succinimide ester, 5(6)-FAM SE,FLUOS, 5(6)-Carboxyfluorescein N-succinimidyl ester; 3-(2,5-dioxopyrrolidin-1-yl)oxycarbonyl-2-(3-hydroxy-6-oxoxanthen-9-yl)benzoic acid,4-(2,5-dioxopyrrolidin-1-yl)oxycarbonyl-2-(3-hydroxy-6-oxoxanthen-9-yl)benzoic acid;, 5(6)-FAM,SE