White solid soluble in H2O and DMSO Store at 4°C. Protect from light, especially in solution. &lamba; Ex/&lamba; Em = 344nm443nm ε (344 nm, H2O) = 3,700 C15H15NO4S MW: 281 [83907-40-8] White solid soluble in H2O and DMSO 2 Store at 4°C. Protect from light, especially in solution. &lamba; Ex/&lamba; Em = 344nm443nm ExEm ε (344 nm, H2O) = 3,700 2 C15H15NO4S 15154 MW: 281 [83907-40-8]