5(6)-Carboxyfluorescein N-hydroxysuccinimide ester;C 1609; Carboxyfluorescein Succinimidyl Ester; FLUOS; NHS-Fluorescein; Pierce NHS-Fluorescein; 1-[[[3',6'-Dihydroxy-3-oxospiro[isobenzofuran-1(3H),9'-[9H]xanthen]-5(or 6)-yl]carbonyl]oxy]-2,5-pyrrolidinedione
