Amine-reactive form of single isomer carboxyrhodamine 110. For certain applications, the dye is preferred over the corresponding 6-carboxyfluorescein because of its exceptional photostability and fluorescence insensitivity to pH change (4-9). &lamba;Ex/&lamba; Em(MeOH) = 502/524 nm Orange red solid soluble in DMF or DMSO Store at -20°C and protect from light C33H36N4O7 MW: 600.67