4arm-PEG-SC (4arm-PEG-Succinimidyl Carbonate), MW 5K is a four-terminal succinimidyl carbonate. The number of ethylene oxide units in the PEG chain may not be equal for all arms.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.