TAMRA-PEG4-t-butyl ester CAS:2353409-64-8 is a TAMRA red fluorescent dye linker with excitation/emission maxima at 553/575 nm containing a tert-butyl protected carboxyl group that can be deprotected under acidic conditions.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.