TCO-PEG4-CH2 NHS ester is a high-purity heterobifunctional linker with a TCO group for rapid, catalyst-free click chemistry with tetrazines, and an NHS ester specifically for stable amide bond formation with amines. The PEG4 spacer enhances solubility and reduces steric hindrance, making it especially suited for multifunctional probe development.
Polyethylene Glycol PEG Linkers > TCO PEG > TCO-PEG-NHS ester
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