Sodium Fluoresceinate

CI 45350, Fluorescein sodium, disodium 2-(3-oxo-6-oxido-3H-xanthen-9-yl)benzoate; C₂₀H₁₀Na₂O₅ = 376.3 (518-47-8)

Orange-red powder, freely soluble in water. Aqueous solutions display an intense yellowish-green fluorescence.