Product Description
4-Arm PEG-glutamic acid (4-arm PEG-GA) is a multiarm PEG derivative with carboxylic acid groups at each terminal of the 4 arms connected to one pentaerythritol core. There is a C3 hydrocarbon ester between PEG and the glutamic acid COOH group. PEG acid can be used to react with amine groups with peptide coupling reagents such as NHS and DCC, EDC.
