(S,E)-TCO2-PEG3-acid
(S)-TCO-PEG3-acid is a click chemistry PEG linker with a terminal carboxylic acid(COOH) group. The terminal carboxylic acid is reactive with primary amine groups to form a stable amide bond. (S)-TCO-PEG3-acid is a PEG-based PROTAC linker can be used in the synthesis of PROTACs.