5(6)-ROX, SE (full name: 5-(and-6)-Carboxy-X-rhodamine, succinimidyl ester) is an amine-reactive long wavelength rhodamine dye.

• λ_Ex/λ _Em (MeOH) = 568/595 nm
• Dark red solid soluble in DMSO or DMF
• Store at -20°C and protect from light
• C₃₇H₃₃N₃O₇
• MW: 631.7
• [114616-32-9]