Biotium developed CPMTS as an alternative to the widely used thiol-reactive coumarin dye CPM. CPMTS and CPM have nearly identical absorption and emission spectra. However, CPMTS contains a MTS group, which could make the dye more advantageous than CPM for sulfhydryl labeling because of the high selectivity and reactivity of MTS reagents toward thiol groups.        Off-white solid soluble in DMF or DMSO    Store desiccated at -20°C and protect from light    C27H33N3O6S2    MW: 560