Compounds used for surface protection studies. A. Thiol-PEG4-alcohol. B. Thiol-dPEG®4-acid (Quanta BioDesign PN10247). C. S-acetyl-thiol-dPEG®4-alcohol, which was not used in the study but is the S-acetyl-protected version of 3a. 3c is Quanta BioDesign product number 10156.
