&lamba; Ex/&lamba; Em= 492/520 nm ε = 75,000 Orange solid soluble in DMF or DMSO Store at -20°C and protect from light, especially in solution C21H11NO5S. MW: 389.4 3326-32-7] &lamba; Ex/&lamba; Em= 492/520 nm ExEm ε = 75,000 Orange solid soluble in DMF or DMSO Store at -20°C and protect from light, especially in solution C21H11NO5S. 21115 MW: 389.4 3326-32-7]