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Fluorescein-PEG5-NHS ester is a fluorescein labeled PEG linker containing a NHS group, which enables labeling for antibodies and other purified proteins at primary amines (lysine side chains). The hydrophilic PEG spacer arm increases solubility in aqueous media.

Fluorescein-PEG5-NHS ester is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1].

PEGs

[1] An S, et al. Small-molecule PROTACs: An emerging and promising approach for the development of targeted therapy drugs. EBioMedicine. 2018 Oct;36:553-562 DOI:10.1016/j.ebiom.2018.09.005